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All Patents of Type: center drilling machines | |||||
Number | Date | Patentee | Title | Type | |
372,730 | Nov. 08, 1887 | H.P. Wellman | Centering Device | center drilling machines | |
376,838 | Jan. 24, 1888 | A. Whitney | Drilling Machine | center drilling machines | |
390,108 | Sep. 25, 1888 | A. Whitney | Center Drilling Machine | center drilling machines | |
680,724 | Aug. 20, 1901 | W.W. Holmes, J. McCarthy, F.W. Mussetter | Duplex Centering Machine | center drilling machines | |
2,701,482 | Feb. 08, 1955 | G.L. Otto | Milling and center-drilling machine | milling machines |