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| All Patents in class 200/553 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,772,964 | Aug. 12, 1930 | R.F. Shunk | Handle switch construction | vacuum cleaners | |
| 2,603,321 | Jul. 15, 1952 | J.B. Lukey, J.N. Flannery, J.B. Armitage | Machine Tool Control Mechanism | milling machines | |