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| All Patents in class 180/220 | |||||
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| Number | Date | Patentee | Title | Type | |
| 561,886 | Jun. 09, 1896 | A.A. Hamerschlag | Eletrical Igniting Device for Gas or Petroleum Engines | ignition systems | |
| 1,210,639 | Jan. 02, 1917 | J. Geisslinger | Generator for electric lamps | electric generators | |