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US Patent: 242,895
Beam Compass
Patentee:
Louis K. Derby - Philadelphia, PA

USPTO Classifications:
33/27.032

Tool Categories:
layout tools : compasses : trammels

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Walter Hargrave
William D. Taylor

Patent Dates:
Applied: Nov. 13, 1880
Granted: Jun. 14, 1881

Patent Pictures:
USPTO pdf tiff
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