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| All Patents in class 174/53 | |||||
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| Number | Date | Patentee | Title | Type | |
| 191,826 | Jun. 12, 1877 | L. Bollmann | Machines for Cutting Screw Threads | metal threading machines | |
| 1,604,237 | Oct. 26, 1926 | C.D. Platt | Electric switch box | electric switches | |
| 2,936,329 | May 10, 1960 | P. Zasadny | Switch mounting | electric switches | |