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| All Patents in class 409/254 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,002,924 | May 28, 1935 | E.G. Roehm, M. Romaine | Broaching Machine | ||
| 2,333,337 | Nov. 02, 1943 | C.M. Beach, E.C. Rachrs | Broaching Machine | ||
| 2,507,581 | May 16, 1950 | H.P. Baecker, W.P. McDonald, M.V. Waters | Safety Device for Broaching Machines | ||
| 3,372,620 | Mar. 12, 1968 | C.F. Stuemer | Interference Detection Mechanism for Machine Tools | ||