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US Patent: 151,521
Improvement in Plumb Bobs
Patentee:
Justus A. Traut - New Britain, CT

USPTO Classifications:
33/393

Tool Categories:
layout tools : plumb bobs

Assignees:
The Stanley Rule & Level Co. - New Britain, CT

Manufacturer:
The Stanley Rule & Level Co. - New Britain, CT

Witnesses:
James Shepard
Fred N. Stanley

Patent Dates:
Applied: Apr. 28, 1874
Granted: Jun. 02, 1874

Patent Pictures: [ 1 | 2 ]
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Description:
Plumb bob with a frame above the bob with the cord in a friction spool.

Some early known examples are incorrectly marked with the patent application date of APR 28, 74 instead of the patent date.

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