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US Patent: D108,143
Design for a Wrench Member
Patentee:
Sigmund Mandl (exact or similar names) - Milwaukee, WI

USPTO Classifications:
81/121.1, D8/29

Tool Categories:
wrenches : wrench components : wrench sockets

Assignees:
Blackhawk Mfg. Co. - Milwaukee, WI

Manufacturer:
Blackhawk Mfg. Co. - Milwaukee, WI

Witnesses:
Unknown

Patent Dates:
Applied: Feb. 27, 1937
Granted: Jan. 25, 1938

Patent Pictures:
Sigmund Mandl design patent Jan. 25, 1938
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Description:
The design is for a round socket with three grooves and a rounded taper in the body.

Alloy Artifacts shows the Blackhawk #401xx series sockets with the three rings on the drive end. The smallest sizes of the socket also have the rounded taper.

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