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US Patent: 1,529,209
Protractor
Patentee:
John W. Parker (exact or similar names) - Barrington, RI

USPTO Classifications:
33/450

Tool Categories:
rules

Assignees:
Brown & Sharpe Mfg. Co. - Providence, RI

Manufacturer:
Brown & Sharpe Mfg. Co. - Providence, RI

Witnesses:
J. A. Miller
S. N. Barry

Patent Dates:
Applied: Dec. 15, 1923
Granted: Mar. 10, 1925

Patent Pictures:
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Vintage Machinery entry for Brown & Sharpe Mfg. Co.
Description:
This patent number was seen on a Brown & Sharpe No. 554 Adjustable Square. The innovation is a protractor that is easily removed based on the longitudinal groove on the rule being engaged with a rib that is tightened by a screw.

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