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| All Patents in class 29/DIG.57 | |||||
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| Number | Date | Patentee | Title | Type | |
| 787,339 | Apr. 11, 1905 | R.F. Massa | Attachment for Drop Hammers | drop hammers | |
| 1,664,983 | Apr. 03, 1928 | G.C. Kimmel | Automatic Coolant-Arresting Mechanism | grinding machines | |
| 1,714,603 | May 28, 1929 | H.B. Kraut | Machine for Reclaiming Rails | rail cutting machines | |
| 1,738,646 | Dec. 10, 1929 | B.P. Graves | Coolant Supply for Milling Machines | milling machine accessories | |
| 2,063,756 | Dec. 08, 1936 | E.G. Roehm, M. Romaine | Broaching Machine | broaching machines | |