Keyboard guide

Details Keyboard guide Keyboard guide

1975-01-27

1976-12-28

Stearman, Joel

Musical instruments

Keyboard type

Organ or cabinet therefor

D1799

Patent

active

D02428776

REFERENCES:
patent: 257790 (1882-05-01), Wagner
patent: 529928 (1894-11-01), Lyle
patent: 3350973 (1967-11-01), Weis et al.

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