US Patent: 1,365,991
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Combined Fixed-Angle Square and Protractor
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Patentee:
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Alfred H. Helden (exact or similar names) - Kansas City, MO |
Manufacturer: |
Not known to have been produced |
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Patent Dates:
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Applied: |
Feb. 28, 1919 |
Granted: |
Jan. 18, 1921 |
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Ralph Brendler
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Description: |
This bevel square provides two indicator points, allowing both the angle and its converse to be read at once. |
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