US Patent: 718,817
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| Protracting Square
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Patentees:
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| Stevenson A. Caldwell (exact or similar names) - Little Sioux, IA |
| Seymour B. Terry (exact or similar names) - Little Sioux, IA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Apr. 25, 1902 |
| Granted: |
Jan. 20, 1903 |
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Ralph Brendler
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Description: |
| This design encases a pivoting metal square in a protractor frame, allowing it to be used to measure and mark angles and their converse. |
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