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| All Patents in class 200/18 | |||||
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| Number | Date | Patentee | Title | Type | |
| 520,748 | May 29, 1894 | J.S. Bancroft | Method of Operating Electric Motors | motor controls | |
| 2,259,645 | Oct. 21, 1941 | W.S. Landon | Heating System and Control Means Therefor | heating apparatus | |
| 2,574,687 | Nov. 13, 1951 | E.P. Bullard | Control | ||
| 2,694,116 | Nov. 09, 1954 | E.P. Bullard, III | Electrical Switch | electric switches | |
| 2,859,290 | Nov. 04, 1958 | C.M. Grinage | Machine Tool Controller | ||
| 2,890,298 | Jun. 09, 1959 | E.C. Bullard, C.M. Grinage | Pendant Switch | ||