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US Patent: 1,390,371
Wrench
Patentee:
Carl Meyer (exact or similar names) - Toledo, OH

USPTO Classifications:
81/116, 81/445

Tool Categories:
wrenches : automotive specialty wrenches

Assignees:
None

Manufacturer:
Carl Meyer - Toledo, OH

Witnesses:
none listed
Patent Dates:
Applied: Feb. 14, 1921
Granted: Sep. 13, 1921

Patent Pictures: [ 1 | 2 ]
Carl Meyer patent September 13, 1921
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Description:
Adjustable wrench for valve port plugs in engine castings. The central screw adjusts the four "blades" which engage slots in these plugs.

These were announced to the automotive trade in mid-1921.

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