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US Patent: 138,790
Improvement in Plumb Bobs
Patentee:
George B. Cowles - Bridgeport, CT

USPTO Classifications:
33/393

Tool Categories:
layout tools : plumb bobs

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
A. Skaats
G. Skaats

Patent Dates:
Applied: Mar. 10, 1873
Granted: May 13, 1873

Patent Pictures:
USPTO pdf tiff
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Description:
Recess in the bob holds the hanging cord.

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