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| All Patents in class 313/147 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 480,272 | Aug. 09, 1892 | E.I. Nichols | Ignitor for Gas Engines | ||
| 568,180 | Sep. 22, 1896 | N. Tesla | Apparatus for producing electrical currents of high frequency | ||
| 626,352 | Jun. 06, 1899 | G.W. De Tunzelmann | Apparatus for Holding Carbons for Electric Welding | ||
| 2,381,648 | Aug. 07, 1945 | F.W. Curtis | Spark Gap | ||