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| All Patents in class 144/237 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,495,067 | May 20, 1924 | G.W. Conklin | Hob Having Side-tooth Inserts | gear cutting tools | |
| 2,751,942 | Jun. 26, 1956 | W.A. Papworth, A.N. Emmons | Cutter arbor shaft for portable power operated tools | handheld circular saws | |
| 3,487,865 | Jan. 06, 1970 | F.F. Chapman, D. Hill | Cutter-head | cutterheads | |
| RE27,654 | Jun. 05, 1973 | D. Hill, F.F. Chapman | Cutter-head structure | cutterheads | |