US Patent: 1,436,471
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Method of Combining Protractor and Beam Compass in one Drafting Tool
Combined Protractor and Trammel
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Patentee:
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| Alonzo E. Bell (exact or similar names) - Spokane, WA |
| USPTO Classifications: |
| 33/26 |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Dec. 30, 1920 |
| Granted: |
Nov. 21, 1922 |
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Ralph Brendler
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Description: |
| This is a draftsman's tool combining an accurate protractor with a beam compass.
Very similar tools were produced by Starrett and Brown & Sharpe, but it is not clear whether they were based on this patent. |
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