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| All Patents in class 451/475 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,925,709 | Sep. 05, 1933 | H.W. Zimmerman | Cylinder grinding tool | automotive tools | |
| 1,957,485 | May 08, 1934 | H.W. Zimmerman | Cylinder grinding tool adjusting mechanism | automotive tools | |
| 1,987,457 | Jan. 08, 1935 | H.W. Zimmerman | Cylinder grinding tool | automotive tools | |
| 2,343,500 | Mar. 07, 1944 | W.M. Fairbairn, S.M. Burdick | Honing apparatus | honing machines | |