4. Stoves and furnaces
  5. Hot-air furnaces
  6. Preliminary air heater
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Heat recovery apparatus for use with a non-high efficiency furna

Stoves and furnaces – Hot-air furnaces – Preliminary air heater
Patent

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Heat saver for household heaters

Stoves and furnaces – Hot-air furnaces – Preliminary air heater
Patent

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Heating with a moving heat sink

Stoves and furnaces – Hot-air furnaces – Preliminary air heater
Patent

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