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| All Patents in class 313/149 | |||||
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| Number | Date | Patentee | Title | Type | |
| 514,168 | Feb. 06, 1894 | N. Tesla | Means for generating electric currents | ||
| 568,180 | Sep. 22, 1896 | N. Tesla | Apparatus for producing electrical currents of high frequency | ||
| 1,917,531 | Jul. 11, 1933 | J.F. Lincoln | Electric Arc Welding Apparatus | welding machines | |