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| Patents for Harold H. Clark | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,489,382 | Apr. 08, 1924 | H.H. Clark, P. Brown | Igniter | ignition systems | |
| 1,532,799 | Apr. 07, 1925 | P. Brown, I.E. Hendrickson, H.H. Clark, T.G. Louis | Magneto | ignition systems | |
| 1,540,603 | Jun. 02, 1925 | H.H. Clark | Interrupter mechanism | ignition systems | |
| 1,555,548 | Sep. 29, 1925 | I.E. Hendrickson, T.G. Louis, H.H. Clark, P. Brown | Breaker-point mechanism and method of operating the same | ignition systems | |