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US Patent: 906,614
Wrench
Patentee:
Halvor Christopherson (exact or similar names) - Kidder, SD

USPTO Classifications:
81/111

Tool Categories:
wrenches : alligator wrenches

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
D. E. Carlsen
L. C. Carlsen
O. Harlen
Carl J. Mohn
Patent Dates:
Applied: Jul. 03, 1908
Granted: Dec. 15, 1908

Patent Pictures:
Halvor Christopherson patent December 15, 1908
USPTO (New site tip)
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Description:
The adjustment mechanism is an arched toothed rack engaging teeth within a slot in the jaw. A cam lever holds the adjustment.

Compare this approach to the H.A. Paquette patent no. 947,346.

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