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| All Patents of Type: pneumatic operated electric switches | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,193,127 | Mar. 12, 1940 | G.H. Hansen, W.C. Furnas | Switch Assembly | pneumatic operated electric switches | |
| 2,307,265 | Jan. 05, 1943 | G.H. Hansen | Switch Mechanisn | pneumatic operated electric switches | |