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| All Patents in class 340/146.2 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,176,847 | Apr. 06, 1965 | R.K. Sedgwick | Tool Identification System | milling machines | |
| 3,487,365 | Dec. 30, 1969 | R. Zechlin, R.M. Henderson | Comparing Circuit | electronic circuitry and apparatus | |
| 3,551,656 | Dec. 29, 1970 | J.A. Wohfeil | Numerical Control System | machine tool controls | |
| 3,744,124 | Jul. 10, 1973 | L.T. Gardner | Machine Tool Retrieval and Interchange System | tool changers and storage mechanisms | |