US Patent: 2,917,813
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| Detachable Tool Holder, Especially for Grooving Files
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Patentees:
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| Hugo Ackermann (exact or similar names) - Kierspe, North Rhine-Westphalia, Germany |
| Gerhard Crümmenerl (exact or similar names) - Kierspe, North Rhine-Westphalia, Germany |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Apr. 10, 1958 |
| Granted: |
Dec. 22, 1959 |
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Joel Havens
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Description: |
| Claims priority, application in Germany filed 02 Aug., 1957. |
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