Piano keyboard level adjusting bar

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Description

FIG. 1 is a side elevational view of a piano keyboard level adjusting bar showing my new design, the other side being substantially identical;

FIG. 2 is a top plan view thereof and,

FIG. 3 is a front elevational view thereof, the rear being substantially identical.

Referenced Cited
U.S. Patent Documents
D239726 April 1976 Wintering
476766 June 1892 Kringel
Other references
  • 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.
Patent History
Patent number: D255904
Type: Grant
Filed: Oct 20, 1977
Date of Patent: Jul 15, 1980
Inventor: Gilles Therrien (Montreal Nord, Quebec)
Primary Examiner: Joel Stearman
Assistant Examiner: Jane E. Corrigan
Attorney: Raymond A. Robic
Application Number: 5/844,052
Classifications
Current U.S. Class: Element Or Attachment (D17/9); Miscellaneous (D17/99)
International Classification: D1701;