4. Pulse or digital communications
  5. Repeaters
  6. Testing

John E. Trombly

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Audio and full duplex digital data carrier system

Pulse or digital communications – Repeaters – Testing
Patent

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Digital data transmission system

Patent

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Electromagnetically coupled battery charger

Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent

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Keyhole-less electronic lock

Electricity: electrical systems and devices – Control circuits for electromagnetic devices – For relays or solenoids
Patent

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Lock system

Communications: electrical – Digital comparator systems
Patent

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Profile ID: LFUS-PAI-P-716961

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