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| All Patents in class 173/44 | |||||
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| Number | Date | Patentee | Title | Type | |
| 6,237 | Mar. 27, 1849 | J.J. Couch | Machinery for drilling rocks | mining apparatus | |
| 1,491,523 | Apr. 22, 1924 | G.H. Ekstrom | Adjustable drilling and balancing tool | balancing machinery | |
| 2,148,348 | Feb. 21, 1939 | W.F. Groene, H.J. Siekmann | Turret lathe | turret lathes | |
| 2,706,892 | Apr. 26, 1955 | A.H. Dall, H. Fritschi | Tracer Control Circuit for Pattern Controlled Machines | profiling machines | |
| 2,972,868 | Feb. 28, 1961 | B. Sassen | Machine tool slide control | ||