US Patent: 1,432,834
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Folding Rule
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Patent Dates:
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Applied: |
Nov. 15, 1919 |
Granted: |
Oct. 24, 1922 |
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Russ Allen.
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Description: |
Improved extension strip with a flat spring mounted in the bottom of the slot (to engage a slot on the strip when fully extended) and a button stop mounted on the other end of the strip. |
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