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| Patents for Automotive Maintenance Machinery Co. | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,269,503 | Jan. 13, 1942 | H.W. Zimmerman | Torque measuring wrench | torque wrenches | |
| 2,320,023 | May 25, 1943 | H.W. Zimmerman | Torque measuring wrench | torque wrenches | |
| 2,331,523 | Oct. 12, 1943 | F.G. Wacker | Cylinder grinding tool | automotive tools | |
| 2,391,183 | Dec. 18, 1945 | W.F. Mitchell | Centering means for boring machines | boring and turning machines | |