4. Internal-combustion engines
  5. Starting device
  6. For airplane

Richard E. Callahan

Inventor

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14 mm extension spark plug

Electric lamp and discharge devices – Spark plugs – Shaped electrode chamber – insulator end – shell skirt – baffle...
Reexamination Certificate

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Glow plug control circuit

Internal-combustion engines – Starting device – For airplane
Patent

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Spark plug tester ignition system

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent

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Profile ID: LFUS-PAI-P-1173522

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