I suspect the Themodist pianos were mostly UK built except for AEolian
pianos.  I have only seen snakebite tracker bar holes on  British and
early American (pre 1910) and AEolian pianos.  I found it on an English
Triumph Autopiano where it was labelled "Triumphodist"  I suspect it was
a good idea that the Brits stole because the American patent laws would
not let the American companies do so.  The triumph had an "Autopiano(?)"
stack that was for all purposes a Cable Nelson stack with the oval
pouches in two tiers.  This made for a shorter piano and stack.

D. L. Bullock  Piano World  St. Louis