US Patent: 1,430,990
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| Calipers
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Patentee:
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| Henry Hendrickson (exact or similar names) - Telluride, CO |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Apr. 20, 1920 |
| Granted: |
Oct. 03, 1922 |
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Ralph Brendler
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Description: |
| This is a design for calipers capable of taking and holding three separate measurements at once. |
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