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US Patent: 151,521
Improvement in Plumb Bobs
Patentee: Justus A. Traut (exact or similar names) - 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 ] USPTO (New site tip) Google Patents Report data errors or omissions to steward Russ Allen.
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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