4. Electricity: electrical systems and devices
  5. Control circuits for electromagnetic devices
  6. For relays or solenoids

Bartholomew L. Toth

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Control for heat pump with auxiliary heat source

Heat exchange – With timer – programmer – time delay – or condition responsive... – Having heating and cooling capability
Reexamination Certificate

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Control system for gas fired heating apparatus using double-thro

Combustion – Timer – programmer – retarder or condition responsive control – Sensor of electrical condition or temperature of electrical...
Patent

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Fuel burner control system with hot surface ignition

Combustion – Timer – programmer – retarder or condition responsive control – Actuation sequence of electric feed heater and feed flow...
Patent

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Fuel burner control system with hot surface ignition

Combustion – Timer – programmer – retarder or condition responsive control – By combustion or combustion zone sensor
Patent

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Hardwired or battery powered digital thermostat

Automatic temperature and humidity regulation – With timing element – Timer other than clock
Reexamination Certificate

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Profile ID: LFUS-PAI-P-625361

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