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| All Patents in class 29/251 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,312,671 | Aug. 12, 1919 | E.E. Bartlett | Arbor-press | arbor presses | |
| 1,356,905 | Oct. 26, 1920 | F. Burtt | Mandrel-press | arbor presses | |
| 1,397,910 | Nov. 22, 1921 | R.W. Taylor, Sr. | Mandrel-press | arbor presses | |
| 1,488,657 | Apr. 01, 1924 | I.A. Weaver | Press | arbor presses | |
| 1,544,393 | Jun. 30, 1925 | O.M. Hatcher, J.C. Campbell | Arbor-press | arbor presses | |
| 1,645,521 | Oct. 18, 1927 | J.G. Collins | Mandrel press | ||
| 1,783,250 | Dec. 02, 1930 | R.E. Manley | Lever mechanism | screw presses | |