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| All Patents in class 40/913 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 2,161,163 | Jun. 06, 1939 | T.L. Hedgpeth | Tool having identification insignia | |
| 3,052,999 | Sep. 11, 1962 | C.B. Sipek, R.K. Sedgwick | Identifying Means for Tools | ||
| 3,128,645 | Apr. 14, 1964 | M.L. Anthony | Machine Tool Changer | ||
| 3,251,150 | May 17, 1966 | C.B. Sipek, R.K. Sedgwick | Identifying Means for Tools | ||