US Patent: 1,451,736
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| Internal Gauge
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Patentee:
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| Karl Lauer (exact or similar names) - Essen, Germany |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Nov. 29, 1921 |
| Granted: |
Apr. 17, 1923 |
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Joel Havens
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Description: |
| Knight & brothers - patent attorneys
Specification signed in Germany 22 Oct 1921. |
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