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US Patent: 1,328,428
David F. Graham - Coudersport, PA

USPTO Classifications:
81/124.6, 81/185, 81/28

Tool Categories:
wrenches : socket wrenches

Graham Roller Bearing Company - Coudersport, PA

Graham Roller Bearing Company - Coudersport, PA

M. Louise Thurston
Lenn Gilman
F. A. French
Arthur B. Mann

Patent Dates:
Applied: May 08, 1919
Granted: Jan. 20, 1920

Patent Pictures: [ 1 | 2 ]
David F. Graham patent January 20, 1920
USPTO pdf tiff
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The focus of the patent is the sleeve and spring which connect the socket and handle. The socket will fit on either end of the handle, which has a uniform cross-section throughout.

An illustration in a June, 1920 AUTOMOBILE TOPICS ad for the set shows the spring clip, and sockets matching Graham's design patent no. D59,417.

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