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| All Patents in class 73/85 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,571,310 | Feb. 02, 1926 | C.H. Wilson | Penetrator for testing penetration hardness | metal hardness testers | |
| 1,768,639 | Jul. 01, 1930 | W.F. Shore, A.F. Shore | Gauge | metal hardness testers | |
| 2,361,441 | Oct. 31, 1944 | C.H. Wilson | Hardness testing indenter | metal hardness testers | |
| 2,362,941 | Nov. 14, 1944 | D.F. Sklar | Penetrator chuck retainer | metal hardness testers | |