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US Patent: 37,865
Improvement in Wrenches
George W. Griswold - Logansport, IN

USPTO Classifications:
81/124.4, 81/125.1

Tool Categories:
wrenches : nut wrenches


Russell and Erwin Mfg. Co. - New Britain, CT

A. H. Barnett
S. N. Barnett
Harry W. Price
John Mathys

Patent Dates:
Granted: Mar. 10, 1863

Patent Pictures: [ 1 | 2 ]
George W. Griswold patent March 10, 1863
USPTO pdf tiff
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Each opening of a flat wrench with multiple "notches" fits two sizes. Wrenches conforming to and citing this patent were marketed in the later 1860s.

Ken Cope's "American Wrench Makers 1830-1930" cites a hardware catalog listing crediting production to the Russell and Erwin Mfg. Co., New Britain, CT.

Many malleable iron "implement wrenches" were made with double-size openings like those described in this patent.

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