| Digest Nr | Subject and Author |
 |
| 2001.04.11.09 |
1924 Pleyel Synchronizing Patent at Web Site, from Douglas Henderson |
| 2000.04.11.08 |
Pleyel Synchronizing Patent Illustrations, from Douglas Henderson |
| 2000.04.09.04 |
Pleyel Patent for Synchronizing Music Roll, from Douglas Henderson |
| 2000.04.09.03 |
Synchronizing Seeburg KT Special Tune Indicator, from Bill Masterman |
| 1999.04.26.06 |
Roll Scanner Motors and Synchronizing, from Horst Mohr |
| 1999.03.16.13 |
Synchronizing Music Rolls and Measure Bars, from Don Teach |
| 1998.11.05.15 |
Synchronizing Duo-Art With Orchestra, from Dan Wilson, London |
| 1998.11.04.13 |
Synchronizing Player Piano with Phono Record, from Darrell Clarke |
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