MMD > Archives > Subject Index > (U) > Unit


The most recent submissions are listed first.


Digest NrSubject and Author
2025.07.27.01Seek Used Set of Aeolian Plastic Unit Valves, from Dan Holstein
2024.03.13.02Vacuum Unit For Reproduco Unified Theatre Organ, from Dennis Steckley
2024.03.09.01Seek Vacuum Unit For Reproduco Unified Theatre Organ, from Jack M. Conway
2024.01.25.02Making Wurlitzer Unit Valves, from Wallace Venable
2024.01.24.03Making Wurlitzer Unit Valves, from Jeff Kunkel
2023.12.02.02Seek Reproduco or Coinola Unit Pneumatics, from Benjamin Haass
2023.04.02.03Doyle Lane Plastic Unit Valve Idea Booklet, from Jim Marke
2023.03.17.02Spinet Ampico A With Single Crescendo Unit, from Eli Shahar
2023.01.31.02Aeolian Clear Plastic Unit Valves, from Ben Roth
2023.01.28.04Ampico 'B' Unit Valve Ball Bleeds, from John A. Tuttle
2022.09.06.01Wurlitzer Unit Valve Passages, from Steve Muscato
2022.08.20.01Seek Wood Button for Wurlitzer 4-in-1 Unit Valve, from Julie Porter
2022.08.13.01Seek Wood Button for Wurlitzer 4-in-1 Unit Valve, from Harold Ulmer
2022.01.06.01Seek Ampico B Unit Valves, from Robert Stout
2021.12.20.02Seek Dynavoice or Electrone Keytop Player Unit, from Luke Myers
2021.06.28.03Seek Simplex Unit Pneumatics, from Bruce Stevens
2021.06.27.02Seek Foot Pump Unit for Standard Player Action, from John Acton
2021.04.23.03Amphion Upside-down Unit Valves, from Jeff Bridges
2021.04.20.02Seek Early Amphion Upside-down Unit Valves, from Bill Chapman
2021.04.16.01Seek Early Amphion Upside-down Unit Valves, from Andrew Thomson
2021.03.24.03Pipe Organ Player Unit, from Dennis Steckley
2021.03.22.02FS: Pipe Organ Player Unit, from Dwayne Stagg
2021.03.20.03Seek Amphion Upside-down Unit Valves, from Kermit Hobbs
2021.03.14.03Ampico Unit Valve Calibrating Machine Patent, from John Grant
2021.03.12.05Ampico Unit Valve Calibrating Machine, from Gordon Stelter
2021.03.11.03Ampico Unit Valve Calibrating Machine Patent, from John Grant
2021.03.09.01Seek Ampico Unit Valve Calibrating Machine Patent, from John Grant
2020.12.26.03Making Wurlitzer Unit Valves, from Don Teach
2020.07.23.05FS: Pipe Organ Roll Player Unit, from Dwayne Stagg
2020.05.22.01Seek Roesler-Hunholz Pipe Organ Player Unit, from Gary Shipe
2020.01.21.04Seek Bell Unit For a Wurlitzer CX, from John Ravert, Sr.
2019.06.24.01Seek Roesler-Hunholz Pipe Organ Player Unit, from Gary Shipe
2019.05.16.06FS Free: PPCo Simplex Unit Pneumatic Tester, from Ed Chaban
2019.03.22.05FS: Pipe Organ Player Unit, from Keith Gramlich
2019.03.21.04FS: Pipe Organ Player Unit, from Dwayne Stagg
2019.03.09.03PianoDisc Solenoid Player Unit Sold, from Philip Jamison
2019.03.06.01FS: PianoDisc Solenoid Player Unit, from Philip Jamison
2018.07.24.10Piano in Storage Unit in Eau Claire, Wisconsin, from Don Teach
2018.07.23.05Piano in Storage Unit in Eau Claire, Wisconsin, from David Banker
2018.07.21.04Piano in Storage Unit in Eau Claire, Wisconsin, from Paul Kealy
2018.07.21.03Piano in Storage Unit in Eau Claire, Wisconsin, from David Dewey
2018.07.20.03Piano in Storage Unit in Eau Claire, Wisconsin, from Marc Sachnoff
2018.04.14.02Seek Lock & Cancel Valve Unit, from Kermit Hobbs
2018.04.04.05Seek Replacement Unit Valves For Wurlitzer AX, from David O'Connor
2018.03.13.04FS: Welte Grand Player Unit, Complete, from Allen Velthoen
2018.03.03.03Seek Doyle Lane Reproduction Unit Valves, from Bruce Pier
2018.03.01.05Seek Doyle Lane Reproduction Unit Valves, from Warren Officer
2018.01.11.03"Simple" Trick for Simplex and other Unit Pneum, from Luke Myers
2018.01.02.06Converting Simplex Unit to Normal Pneumatic, from Luke Myers
2018.01.01.07Converting Simplex Unit to Normal Pneumatic, from David Dewey
2017.12.31.07Converting Simplex Unit to Normal Pneumatic, from Luke Myers
2017.12.29.03Duo-Art Expression Unit Worm Gear & Shaft, from John Grant
2017.12.28.03Seek Simplex Unit Pneumatics, from Luke Myers
2017.12.26.03Seek Duo-Art Expression Unit Worm Gear & Shaft, from Mark Washek
2017.05.29.05Seek QRS Pianomation 2000CD+ CD Player Unit, from Luke Lindblom
2017.03.13.03Seek Expression Unit for Upright Welte Licensee, from David Oppenheim
2016.12.01.04Seek Cork Gaskets for Ampico Late "A" Unit Valves, from Mike Walter
2016.08.09.02Seek Amphion Upside-down Unit Valves, from David Opppenheim
2016.07.31.03Seek Amphion Unit Valve Blocks, from Jason Jackson
2016.07.28.03Seek Doyle Lane Plastic Band Organ Unit Valves, from Larry Kern
2016.05.07.06FS: Model B Lower Unit for Hupfeld Phonoliszt, from Tim Johnson
2016.04.15.06FS Free: Gulbransen Unit Pneumatics, from Eric Bergstrom
2016.03.14.07Yamaha MX100A Control Unit Upgrade, from Jon Page
2016.01.03.01Seek Lower Unit for R. S. Howard Player Piano, from Tom Plank
2015.10.16.02FS: Ampico B Unit Valves & Pumps, from Gary Hanson
2015.09.06.02Seek Lower Unit for J. Bauer & Co. Player Piano, from James J. White
2015.08.20.07FS: A-Roll Remote Electric Player Unit, from Matthew Dow
2014.09.03.04FS: Ampico B Unit Valve Block Springs, from John A. Tuttle
2014.08.14.07Ampico B Unit Valve Block Springs, from John A. Tuttle
2014.08.07.03Ampico B Unit Valve Block Springs, from John A. Tuttle
2014.07.04.02Supplier of Wurlitzer Unit Valves, from Matthew Caulfield
2014.07.03.02Seek Supplier of Wurlitzer Unit Valves, from Steve Bentley
2014.02.16.04Seek MC-1 Pianocorder MIDI Adapter Unit, from Michael Pedersen
2013.10.08.08Hobart M. Cable Player Unit Problem, from Don Teach
2013.10.07.03Hobart M. Cable Player Unit Problem, from Nevin Engle
2013.09.16.06Wurlitzer Transmission Unit Valve Problem, from Dale F. Rowe
2013.09.16.05Wurlitzer Transmission Unit Valve Problem, from Ken Vinen
2013.09.15.02Wurlitzer Transmission Unit Valve Problem, from Mark Weyna
2013.06.25.07FS: New Wurlitzer Unit Valves, from Robert Loeffler
2013.06.15.03Seek Ampico Model B Pedal Regulator Unit, from Mike Walter
2013.05.10.04FS: Tremolo Unit from Reproduco Piano-organ, from Bill Chapman
2013.05.04.03Seek Multiplex Unit for O-roll Orchestrion, from Jeff Bridges
2013.02.18.07Ampico Unit Valve Design, from Gordon Stelter
2012.08.28.05Seek Ampico Model B Pedal Regulator Unit, from Mike Walter
2012.08.16.03Roesler-Hunholz Pipe Organ Player Unit, from Craig Williams
2012.08.15.01Seek Roesler-Hunholz Pipe Organ Player Unit, from Gary Shipe
2012.07.24.04Ampico "A" Unit Valve Variant Discovered, from John Grant
2012.04.19.06Ball Bleeds in Ampico B Unit Valves, from John A. Tuttle
2012.01.30.07FS: Set of 83 Ampico B Ball Unit Valves, from Gary Hanson
2011.05.09.08Seek 22-note Bell Unit for Wurlitzer Band Organ, from Matthew Caulfield
2011.05.03.08FS: Valve Caps for Wurlitzer Unit Valves, from Robert Leber
2011.02.06.08FS: Aeolian Unit Valves & Pianomation Solenoids, from Mark Pichla
2011.01.07.04Seek Pneumatic Unit Valves, from Bernt Damm
2011.01.06.03Sealing Amphion Unit Valves With PVC-E, from Bill Maguire
2011.01.05.03Seek Pneumatic Unit Valves by Doyle Lane, from Jim Marke
2010.09.29.12FS: Wurlitzer Style 125 Spools & Unit Valves, from Ken Vinen
2010.09.19.05Seek Schematic for Ruth 16-bell Unit, from Ed Serowik
2010.06.17.03Player Piano Suction Unit, from Erik York
2010.06.06.09Suction Unit Plays Piano Too Loudly, from Andy Taylor
2010.06.06.08Suction Unit Plays Piano Too Loudly, from Eric Bergstrom
2010.06.05.04Suction Unit Plays Piano Too Loudly, from Richard Moody
2010.05.27.03Seek Player Piano Suction Unit, from Erik York
2010.04.16.09Seek Source of Aeolian Plastic Unit Valves, from Jeff Bridges
2010.03.23.06FS: Lot of Simplex Unit Valves, from David Saleh
2010.03.01.08FS: Simplex Unit Pneumatic Parts, from David Saleh
2010.02.14.06FS: Gulbransen Pump Unit, from David Saleh
2009.08.18.04Making Wurlitzer Unit Valves, from Robert Loeffler
2009.06.15.06Wurlitzer APP Rewind With 4-in-1 Unit Valve, from Julie Porter
2009.06.14.06Wurlitzer Die-cast 4-in-1 Unit Valve Blocks, from John A. Tuttle
2009.06.14.05Wurlitzer APP Rewind With 4-in-1 Unit Valve, from Martin Anderson
2009.06.12.05Making Wurlitzer Unit Valves, from Don Teach
2009.05.04.02Value of Marantz Pianocorder Unit, from nora@
2009.03.29.07Ampico Unit Valve Seats, from Bruce Clark
2009.03.27.05Ampico B Unit Valve Seats, from Bob Stewart
2009.03.20.09Ampico B Unit Valves, from Bob Stewart
2009.03.09.06Hold-down Springs for Ampico Unit Valves, from Bruce Clark
2008.10.27.13Seek Wurlitzer Die-cast 4-in-1 Unit Valve Blocks, from Howard Jensen
2008.10.22.07Wurlitzer Unit Valve Blocks, from Dave Geissinger
2008.10.21.06Wurlitzer Die-cast 4-in-1 Unit Valve, from Larry Emmons
2008.10.20.05Wurlitzer Die-cast 4-in-1 Unit Valve, from Doug Hershberger
2008.10.15.01Seek Unit Valves for Tangley Player Calliope, from Stan Harrison
2008.10.12.03Seek Unit Valves for Tangley Player Calliope, from Stan Harrison
2008.05.18.04Rebuilding Duo-Art Expression Unit, from John Phillips
2008.04.16.06Rebuilding Duo-Art Expression Unit Valves, from Paddy Handscombe
2008.04.15.06Rebuilding Duo-Art Expression Unit Valves, from John Phillips
2007.11.11.14Seek Seeburg "L" 3-position Loudness Control Unit, from Brad Hunter
2007.10.09.10Seek Ampico B Unit Valves & Pneumatics, from Kim Bunker
2007.09.23.10Adjustment of Unit Block Valves, from Robert Loeffler
2007.09.22.06Adjustment of Unit Block Valves, from Doug Hershberger
2007.09.07.03FS: Wurlitzer Unit Valve Parts, from Alan Erb
2007.09.01.05Making Wurlitzer Unit Valve Blocks, from Matthew Caulfield
2007.09.01.04Making Wurlitzer Unit Valve Blocks, from Don Teach
2007.09.01.03Making Wurlitzer Unit Valve Blocks, from Robert Loeffler
2007.08.31.08Making Wurlitzer Unit Valve Blocks, from Howard Jensen
2007.07.20.05Source of Wurlitzer Unit Valve Blocks, from Robbie Rhodes
2007.07.17.06Source of Wurlitzer Unit Valve Blocks, from Damian Mayes
2007.05.29.03Source of Aeolian Plastic Unit Valves, from Deane Wiley
2007.05.09.04Double Bellows Roll Tracking Unit, from Maury Willyard
2007.05.03.07Seek Double Bellows Roll Tracking Unit, from Maury Willyard
2007.04.22.05Seek Ampico B Ball Bleed Unit Valves, from Bruce Clark
2007.04.17.04Seek Ampico B Ball Bleed Unit Valves, from Bruce Clark
2007.04.03.04Seek Ampico B Ball Unit Valves, from David Goodwin
2007.03.20.07Replacement Ampico Unit Valves, from Bruce Clark
2007.02.17.11Seek Late Ampico 'A' Expression Unit & Motor, from Bob Taylor
2007.02.17.06Making Wurlitzer Unit Valves, from Bob Humes
2007.02.04.10Valve Spring in Ampico Crescendo Unit, from Bill Chapman
2007.01.23.09Making Wurlitzer 105 Unit Valves, from Don Teach
2007.01.22.07Rebuilding Unit Valves, from A. B. Bonds
2007.01.22.06Rebuilding Unit Valves, from Bob Hunt
2007.01.21.06Making Wurlitzer 105 Unit Valves, from John Haass
2007.01.19.10Rebuilding Unit Valves, from Pat DeWitt
2007.01.13.08Seek Wurlitzer 105 Unit Valves, from Nigel Perry
2006.10.11.04Ampico-A Unit Valve Blocks Needed, from Rob Buckingham
2006.09.23.06Seek Coinola Unit Valve Blocks, from Stephen Kent Goodman
2006.06.18.09FS: Half Duo-Art Unit from George Steck Piano, from Tim Johnson
2006.06.17.06FS: Themodist Unit from George Steck Piano, from Tim Johnson
2006.02.22.03Humidity Variation Loosens Unit Valves, from Debbie Legg
2005.12.21.14Grease Found in Cecilian Expression Unit, from Mike McCoy
2005.12.05.10Aeolian Plastic Unit Valves, from D. L. Bullock
2005.12.05.09Aeolian Plastic Unit Valves, from Don Teach
2005.09.27.04Model A Ampico Unit Valves & Leaks, from D. L. Bullock
2005.09.25.07Model A Ampico Unit Valves & Leaks, from Bruce Clark
2005.08.29.10Seek Pianocorder Superscan Unit, from Tom Lear
2005.08.17.05Roll Player Unit on Yamaha Electone Organ, from Ryan Meldahl
2005.04.11.08Testing a Themodist Expression Unit, from Malcolm Cole
2005.03.30.10Seek Hofbauer Mikrobox to MIDI Conversion Unit, from Dale Gunnar
2005.02.01.11Seek Broadmoore PowerRoll Unit, from Philip Kaiser
2005.01.17.02Rebuilding Pianola with Plastic Unit Valves, from D. L. Bullock
2005.01.16.05Rebuilding Pianola with Plastic Unit Valves, from Joel Cluskey
2004.12.31.05Hammond BA Player Organ Reverberation Unit, from Don Teach
2004.12.31.04Hammond BA Player Organ Reverberation Unit, from Mark Kinsler
2004.12.30.10Hammond BA Player Organ Reverberation Unit, from Jim Heyworth
2004.12.29.08Hammond BA Player Organ Reverberation Unit, from Daniel D. Tenerowicz
2004.10.31.07Mounting Kimball Plastic Unit Valves, from John A. Tuttle
2004.10.21.05Source of Aeolian Plastic Unit Valves, from Arthur Marino
2004.10.18.05Wurlitzer Unit Valves, from Dale Gunnar
2004.09.24.05Source of Wurlitzer Unit Valves of Wood, from Don Teach
2004.09.23.05Seek Wurlitzer Unit Valves of Wood, from Larry Hall
2004.09.08.03FS: Organ Player Unit, Possibly Kilgen, from Dwayne Stagg
2004.07.28.06Dynavoice Keytop Player Striker Unit Mounting, from Mike Knudsen
2004.01.27.04Seek Rebuildable Plastic Unit Valves, from Ken Rosen
2003.12.04.06Power Unit for Mr. Christmas Merry Go Round, from Vincent Morgan
2003.12.03.12Seek Power Unit for Mr. Christmas Merry Go Round, from Doug Anderson
2003.09.25.08Seek Disk Drive for Yamaha PPC10R Control Unit, from Mario Anzaldua
2003.09.06.03Seek Wurlitzer 105 Unit Valves, from Peter Frodemo
2003.07.30.13Seek Wurlitzer Unit Valves, from Benjamin Haass
2003.06.04.17Yamaha UX16 USB to MIDI Interface Unit, from Bill Klinger
2003.05.30.08Value of "Telectric" Brass Roll Reader Unit, from Frank LaConte
2003.04.27.03Seek Rolls for Smith Unit Organ Player, from Terry Klazer
2003.04.26.04Seek Rolls for Smith Unit Organ Player, from Allen Moe
2003.04.06.08Ampico "A" Wind-Chest Spill Unit Valve Blocks, from Bob Taylor
2003.04.06.07Ampico "A" Wind-Chest Spill Unit Valve Blocks, from Ed Gaida
2003.04.06.06Ampico "A" Wind-Chest Spill Unit Valve Blocks, from Bruce Clark
2003.04.06.05Ampico "A" Wind-Chest Spill Unit Valve Blocks, from D. L. Bullock
2003.03.24.08Plastic Unit Valves from Mike Kitner's Estate, from Julie Porter
2003.03.05.09Quiet Suction Unit For Reed Organ, from Richard Vance
2003.03.05.08Quiet Suction Unit For Reed Organ, from Allen Moe
2003.03.05.07Quiet Suction Unit For Reed Organ, from Fritz Gellerman
2003.03.04.11Seek Quiet Suction Unit For Reed Organ, from Herbert Huestis
2003.03.03.09Source of Aeolian Plastic Unit Valves, from Denis Wilkinson
2003.02.25.11Two Sizes of Ampico B Unit Valves, from Brian Thornton
2003.02.22.03Two Sizes of Ampico B Unit Valves, from Bob Stewart
2003.01.15.07Seek Ampico Unit Valve Retaining Nuts, from Bob Stewart
2002.10.28.05Ampico B Unit Valve Blocks, from Bob Stewart
2002.10.27.05Seek Ampico B Unit Valve Blocks, from Bob Stewart
2002.10.22.08FS: Roll Frames & Wurlitzer Unit Valves, from Alan Erb
2002.09.25.02Value of Moeller Artiste Player Unit, from Berley Firmin
2002.08.27.07Seek Pressure Reserve Unit for Seeburg Celesta, from Stephen Kent Goodman
2002.08.16.08Fixture For Testing Ampico B Unit Valves, from A. B. Bonds
2002.05.04.11Seek Suction Unit for Reed Organ, from Paul Clawser
2002.02.26.12Groaning Noise in Expression Regulator Unit, from Craig Brougher
2002.02.25.11Groaning Noise in Expression Regulator Unit, from Craig Brougher
2002.02.24.10Groaning Noise in Expression Regulator Unit, from William G. Meyer
2002.01.29.06Old Style Inverted Ampico (Amphion) Unit Valves, from Jim Heyworth
2002.01.29.05Old Style Inverted Ampico Unit Valves, from James Jelinek
2002.01.28.06Old Style Inverted Ampico Unit Valves, from Bruce Clark
2001.06.07.04Seek Steiff Upper Unit, from Al Pebworth
2001.06.02.11Seek Player Unit for Wilcox & White Symphony, from Charles Barrett
2001.01.16.15FS: Roll Player and Suction Unit, from William A. Filler
2000.12.29.04Wurlitzer Unit Valve, from Julie Porter
2000.07.06.12New Wurlitzer Unit Valves from PPCo, from Don Teach
2000.07.05.09Sponge Silicone Unit Valves from PPCo, from John A. Tuttle
2000.07.03.03Sponge Neoprene Unit Valves from PPCo, from Brian Thornton
2000.07.01.04Sponge Neoprene Unit Valves from PPCo, from Andy Taylor
2000.06.30.07Wurlitzer Unit Valves from PPCo, from Dan Armstrong
2000.06.29.06Wurlitzer Unit Valves from Player Piano Company, from Don Teach
2000.06.28.08Seek Wurlitzer Wooden Unit Valve Blocks, from Dave McNally
2000.04.26.11Hickman Ampico B Ball Unit Valve, from Randolph Herr
2000.04.13.09Seek Welte Residence Organ Player Unit, from Jim Crank
2000.04.08.11New Ampico 'A' Unit Valve Blocks, from John A. Tuttle
2000.02.24.10Seek Standard Action Player Bottom Unit, from Al Pebworth
2000.02.23.15Seek Seeburg L Credit Unit, from Roger Hughes
2000.01.24.09MC2 MIDI-to-Pianocorder Converter Unit, from Grant Leonard
2000.01.19.13Rebuilding Pianola With Plastic Unit Valves, from D. L. Bullock
1999.12.28.15Granger Electric Suction Unit, from Hal Davis
1999.12.17.08FS: H. C. Bay Pump Unit, Rebuilt, from Stephen Kent Goodman
1999.08.04.10Testing Simplex Unit Pneumatics, from Craig Brougher
1999.08.03.11Testing Simplex Unit Pneumatics, from Bill Maxim
1999.06.09.02Identify Dual Spoolbox Unit, from Dick Beery
1999.04.10.15FS: Bottom Unit for Malcolm Player Piano, from Dan Wilson, London
1999.04.09.03Lower Unit for Aeolian Orchestrelle, from Richard Vance
1999.04.08.16"Credit Unit' Accumulator for Coin Piano, from Bill Kibler
1999.04.08.02Seek Lower Unit for Aeolian Orchestrelle, from Bob Loesch
1999.02.05.19Hammond Reverberation Unit, from Gerhard Dangel
1999.01.13.18FS: Ampico A Player Unit for Grand Piano, from Jon Page
1999.01.11.11Rebuilding Ampico "B" Unit Valves, from Larry Broadmoore
1999.01.10.12Rebuilding Ampico "B" Unit Valves, from Bruce Clark
1999.01.08.12Leaks In Ampico Unit Valves, from Bruce Clark
1998.12.27.11New Ampico Unit Valves From Bob Lemon, from Jon Page
1998.12.26.10Seek New Ampico Unit Valves, from Bruce Clark
1998.10.21.13Rebuilding Themodist Control Unit, from Philip Jamison
1998.10.08.02Smith Unit Organ Rolls, from Russ Doering
1998.10.04.13Smith Unit Organ Rolls, from Allen Moe
1998.08.05.18Model B Ampico Loud Pedal Valve Unit, from Tim Johnson
1998.04.17.08Yamaha MU-10 MIDI Synth Unit, from Don Cox
1997.12.30.14Rebuilding Ampico B Unit Valves, from Bob Taylor
1997.12.29.11Sealing Ampico "B" Unit Valves, from Larry Broadmoore
1997.08.07.13Seek Ampico A Unit Valves, from Jon Page
1997.04.09.12Simplex Unit Pneumatics, from Brett Mohr
1997.04.08.14Seek Unit Valves for Wurlitzer 153, from Matthew Caulfield
1997.04.07.14Help with Simplex Unit Pneumatics., from Bill Boulton
1997.03.10.24FS: Late Ampico A Unit, Complete, from Tom Steuer
1997.02.03.20Seek: Simplex Unit Pneumatics, from Debbie Legg
1997.01.29.11Suction Unit for Testing, from Fritz Gellerman
1997.01.25.23Suction Unit for Testing, from Colin Hinz
1997.01.24.13Re: Adding Recordo Unit, from Don Teach
1997.01.09.07Wurlitzer Roll Frames and Unit Valves, from Matthew Caulfield
1997.01.03.12Ampico B Unit Valves, from Bruce Clark
1996.10.31.04MTP-1 MIDI Unit, from John Wale
1996.10.29.08MIDI to Parallel Unit, from John Wale
1996.10.28.05RE: Help Needed with Stoddard Ampico Unit, from Rob DeLand
1996.10.25.11Gulbransen Unit Pneumatics, from John A. Tuttle
1996.10.24.12Gulbransen Unit Pneumatics, from Craig Brougher
1996.08.04.04Springs for Ampico Unit Valves, from Robbie Rhodes
1995.07.28.04Re: Ampico Expression Test Unit, from Terry Smythe
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