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US Patent: 825,401
John Merckens - Chicago, IL

USPTO Classifications:
7/138, 81/120, 81/177.1, 81/186

Tool Categories:
wrenches : alligator wrenches
combination tools
wrenches : wrench combination tools

Edmonds Metzel Mfg. Co. - Chicago, IL

Edmonds Metzel Mfg. Co. - Chicago, IL

William R. Rummler
A. E. Metzel
Glen C. Stephens
Rudow Rummler

Patent Dates:
Applied: Dec. 05, 1904
Granted: Jul. 10, 1906

Patent Pictures: [ 1 | 2 ]
John Merckens patent July 10, 1906
USPTO pdf tiff
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The patent is for the laminated construction whereby the gripping parts of tempered steel are reinforced by tougher less brittle material. The thread cutters are a separate patent -- No. 828,859 (the drawings are nearly identical!!). The resulting tool with laminated construction is marked "PERPETUAL GRIP ALL PARTS RENEWABLE."

See also patent no. 816,570 for another Edmonds-Metzel alligator wrench design.

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