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US Patent: 2,917,813
Detachable Tool Holder, Especially for Grooving Files
Patentees: Hugo Ackermann (exact or similar names) - Kierspe, North Rhine-Westphalia, Germany Gerhard Crümmenerl (exact or similar names) - Kierspe, North Rhine-Westphalia, Germany USPTO Classifications: 403/353, 407/29.15, 76/36, D8/94 Tool Categories: industrial tools : tool holders industrial tools : tool handles Assignees: Hugo Ackermann - Kierspe, North Rhine-Westphalia, Germany Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Apr. 10, 1958 Granted: Dec. 22, 1959 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens
Description: Claims priority, application in Germany filed 02 Aug., 1957.

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