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All Patents in class 175/404 | |||||
Number | Date | Patentee | Title | Type | |
111,167 | Jan. 24, 1871 | O.O. Witherell, A. Bauman | Improvement in hollow augers | hollow bits | |
1,807,625 | Jun. 02, 1931 | H.J. Hjorth | Valve Wrench | wrenches |