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| All Patents in class 200/453 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 1,690,103 | Nov. 06, 1928 | E.L. Clark | Electric switch | ||
| 1,876,926 | Sep. 13, 1932 | W.C. Heath | Pressure Actuated Switch | ||
 | 2,164,667 | Jul. 04, 1939 | J.B. Sinnett | Motor switch | |