Piano keyboard level adjusting bar

Details Piano keyboard level adjusting bar Piano keyboard level adjusting bar

1977-10-20

1980-07-15

Stearman, Joel

Musical instruments

Keyboard type

Element or attachment

D17 99, D1701

Patent

active

D02559048

REFERENCES:
patent: D239726 (1976-04-01), Wintering
patent: 476766 (1892-06-01), Kringel
Constructing & Manufacturing Wood Products, W. H. Zook, .COPYRGT.'73, p. 303, "FIG. 13-72," Half-Lap.
Metric & Multistandard Components Corp., Elmsford, N.Y., "Metric & British Industrial Supply" Catalog #2008, .COPYRGT.'73, Section 1 Fasteners, Cover, row picturing items #56-64," Wing Nut 2nd from left.

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