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| Patents for Charles L. Clarke | |||||
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| Number | Title | Classification(s) | |||
| 284,382 | Circuit and Apparatus for Electric Temperature and Pressure Indicator | 318/10, 388/836 | |||
| 305,939 | Machine for Coiling Wire and Thread in the Manufacture of Induction and Resistance Coils | 242/444.4, 242/444.5, 242/447.2 | |||