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US Patent: 452,237
Power Wrench
Patentee:
James R. Robinson (exact or similar names) - Washington, PA

USPTO Classifications:
81/57.32

Tool Categories:
wrenches

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Ella M. Robinson
C. M. Ruple
C. Sedgwick
J. E. Clark
Patent Dates:
Applied: Sep. 24, 1890
Granted: May 12, 1891

Patent Pictures:
James R. Robinson patent May 12, 1891
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Description:
Connected hook wrenches for drill stem segments for well drilling equipment. A ratchet-powered screw provided the operating force.

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