US Patent: 1,529,209
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| Protractor
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Patentee:
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| John W. Parker (exact or similar names) - Barrington, RI |
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Patent Dates:
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| Applied: |
Dec. 15, 1923 |
| Granted: |
Mar. 10, 1925 |
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Jeff Joslin
Vintage Machinery entry for Brown & Sharpe Mfg. Co.
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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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