US Patent: 1,436,143
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Calipers, Spring-Calipers and the Like
Screw Adjusted Calipers
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Patentee:
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| Axel Edmond Theodor Bergstrom (exact or similar names) - Stockholm, Sweden |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
May 21, 1920 |
| Granted: |
Nov. 21, 1922 |
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Ralph Brendler
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Description: |
| This patent shows a method of constructing calipers and dividers such that turning a knob on the top of the bow changes the width. |
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