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Patents for Herbert F. Harden | |||||
Number | Date | Patentee | Title | Type | |
725,141 | Apr. 14, 1903 | C.F. Laur, A.E. Robinson | Speed Changing Mechanism | metal lathes | |
761,324 | May 31, 1904 | W.L. Schellenbach | Speed Changing Mechanism | metalworking speed changing mechanisms |