Pocket finger exercise board

Details Pocket finger exercise board Pocket finger exercise board

1975-07-21

1977-04-19

Stearman, Joel

Musical instruments

Keyboard type

Organ or cabinet therefor

D1799

Patent

active

D02441039

REFERENCES:
patent: 501743 (1893-07-01), Stratton
patent: 3785239 (1974-01-01), Smith

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