4. Stoves and furnaces
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  6. Tubular air heater
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Air heating furnace

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

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Compact furnace heat exchanger

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

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Furnace with supplementary heat exchange means

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

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Furnace-heat exchanger preheating system

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

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Gas burning heating device

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

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Highly efficient heat exchanger and combustion chamber...

Stoves and furnaces – Hot-air furnaces – Tubular air heater
Reexamination Certificate

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