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US Patent: 892,326
Nut and Pipe Wrench
David Stewart - Schenectady, NY

USPTO Classifications:

Tool Categories:
wrenches : wrench adjustment types : screw adjust wrenches

Stewart Wrench and Manufacturing Company - Schenectady, NY

Stewart Wrench and Manufacturing Company - Schenectady, NY

Helen Wechsler
Max B. A. Doring
Leslie S. Elting
John C. Grufe

Patent Dates:
Applied: Feb. 26, 1904
Granted: Jun. 30, 1908

Patent Pictures:
David Stewart patent June 30, 1908
USPTO pdf tiff
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The patent claims optional forms for the fixed jaw and "cheeks," and details of construction of the optional forms for the movable jaw structure; parallel patent 892,327 shares many of the design features.

1908 trade journals announce production of the wrench.

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