Pocket finger exercise board

Details Pocket finger exercise board Pocket finger exercise board

1976-10-08

1978-08-29

Stearman, Joel

Musical instruments

Keyboard type

Organ or cabinet therefor

D56 1A, D1799, D1703

Patent

active

D02491826

REFERENCES:
patent: 501743 (1893-07-01), Stratton
patent: 3785239 (1974-01-01), Smith
patent: 3854370 (1974-12-01), Sapinski
patent: 3901119 (1975-08-01), Siminoff

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