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US Patent: 231,331
Bench Plane
Adjustable Frog for Plane Cutter Adjustments
Patentee:
Frederic Kraengel (exact or similar names) - Buffalo, NY

USPTO Classifications:
30/489

Tool Categories:
woodworking tools : planes : plane adjustment mechanisms : plane throat adjustments
woodworking tools : planes : plane adjustment mechanisms : plane cutter adjustments

Assignees:
Emil Jetter - Buffalo, NY
Albert Jetter - Buffalo, NY

Manufacturer:
Not known to have been produced

Witnesses:
Michael J. Stark
Hattie L. Walker
Frank Hirsch

Patent Dates:
Applied: Apr. 30, 1880
Granted: Aug. 17, 1880

Patent Pictures:
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Description:
Kraengel provides a carriage (effectively a frog) for supporting the cutter. The carriage is adjustable forwards and backwards to vary the mouth opening and the angle of the cutter.

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