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Evacuated solar heat collector

Stoves and furnaces – Heaters – Surface
Patent

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Exothermic composition

Stoves and furnaces – Heaters – Chemical
Patent

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Exothermic composition and hot pack

Stoves and furnaces – Heaters – Chemical
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Exothermic composition and hot pack

Stoves and furnaces – Heaters – Chemical
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Exothermic compositions and container for heating food

Stoves and furnaces – Heaters – Chemical
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Exothermic heater device

Stoves and furnaces – Heaters – Chemical
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Exothermic metallic composition

Stoves and furnaces – Heaters – Chemical
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Extruded metal solar collector roofing shingle

Stoves and furnaces – Heaters – Surface
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Fabrication of trough-shaped solar collectors

Stoves and furnaces – Heaters – Surface
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Feeding bottle

Stoves and furnaces – Heaters – Chemical
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Field burner

Stoves and furnaces – Heaters – Surface
Patent

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Field burner apparatus

Stoves and furnaces – Heaters – Surface
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Field burning apparatus

Stoves and furnaces – Heaters – Surface
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Field cooker

Stoves and furnaces – Heaters – Lunch
Patent

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Field sanitizing apparatus

Stoves and furnaces – Heaters – Surface
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Finned tube solar energy absorber

Stoves and furnaces – Heaters – Surface
Patent

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Fire plow

Stoves and furnaces – Heaters – Surface
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Flameless heat generator

Stoves and furnaces – Heaters – Frictional
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Flameless heat source

Stoves and furnaces – Heaters – Frictional
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Flameless heater and method of making same

Stoves and furnaces – Heaters – Chemical
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