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| All Patents in class 451/158 | |||||
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| Number | Date | Patentee | Title | Type | |
| 480,098 | Aug. 02, 1892 | J.B. Howe | Machine for Pouncing Hats | hat making machines | |
| 1,980,872 | Nov. 13, 1934 | A.F. Moul | Apparatus for grinding | sharpening machines | |
| 2,645,886 | Jul. 21, 1953 | D.R. Peterson | Surface Grinder | surface grinders | |