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| All Patents in class 81/447 | |||||
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| Number | Date | Patentee | Title | Type | |
| 163,217 | May 11, 1875 | P.B. Lawson | Expanding Mandrel | mandrels and arbors | |
| 544,606 | Aug. 13, 1895 | J.R. Balsley | Screw Holder and Driver | screwdriver blades | |
| 1,501,889 | Jul. 15, 1924 | C.J. Mick | Internal Pipe Wrench | pipe wrenches | |
| 1,617,150 | Feb. 08, 1927 | J.P. Fisher | Pipe Wrench | pipe wrenches | |
| 2,624,222 | Jan. 06, 1953 | A.R. Joy | Plumber's Spud-Wrench | screw adjust wrenches | |
| 2,771,297 | Nov. 20, 1956 | W. Nipken | Adjustable stop for a collet or the like | work holding | |