Timer, Programmer, Retarder Or Condition Responsive Control Patents (Class 431/18)
- With electrical igniter (Class 431/43)
- Sensor of second burner controls third burner (Class 431/48)
- And an igniting burner for first burner (Class 431/49)
- Sensing of flame at both burners required for continued operation of second burner (Class 431/50)
- Both burners cut off upon sensed extinguishment of first burner (Class 431/51)
- Manual reset of second burner required upon first burner extinguishment (Class 431/57)
- Sensor controls diaphragm motor of second burner valve (Class 431/58)
- Electrical or magnetic sensor controls second burner (Class 431/59)