4. Automatic temperature and humidity regulation
  5. Hot-air furnace
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Thermostatically controlled heating system

Automatic temperature and humidity regulation – Hot-air furnace
Patent

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Thermostatically controlled safety device for oil burners

Automatic temperature and humidity regulation – Hot-air furnace – Air and fire control
Patent

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Tri-state electrical circuit

Automatic temperature and humidity regulation – Hot-air furnace – Air and fire control
Patent

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Two stage furnace control

Automatic temperature and humidity regulation – Hot-air furnace – Air and fire control
Patent

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Variable output heating and cooling control

Automatic temperature and humidity regulation – Hot-air furnace – Air and fire control
Reexamination Certificate

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Variable output heating and cooling control

Automatic temperature and humidity regulation – Hot-air furnace – Air and fire control
Reexamination Certificate

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Warm up method for two stage furnace

Automatic temperature and humidity regulation – Hot-air furnace – Air and fire control
Patent

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Warmup method for a two stage furnace

Automatic temperature and humidity regulation – Hot-air furnace – Air and fire control
Patent

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Window heaters

Automatic temperature and humidity regulation – Hot-air furnace
Patent

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