US Patent: 1,157,825
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| Draftsman's Protractor
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Patentee:
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| Robert N. Van Buskirk (exact or similar names) - Detroit, MI |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Nov. 25, 1912 |
| Granted: |
Oct. 26, 1915 |
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Ralph Brendler
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Description: |
| This protractor features a built-in square reference surface, allowing it to be easily used in combination with a T-square for drawing lines at a specific angle to the vertical. |
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