United States Patent 2937697
US Patent References:
/0838338.html
- - 0838338

Draft regulating system
- - 1809575

Heater control
- - 1833888

Automatic temperature regulator
- - 1921667

Oil burner controls
- - 1955797


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Primary Class:
431/20
Other Classes:
236/1G, 431/19
US Patent References:
2179120Control device for heating systems
2508885Draft controlling stack damper mechanism for conserving heat in furnaces