|
US2667102A
|
|
Photoelectric apparatus
|
|
US2643311A
|
|
Thermal switch
|
|
US2674677A
|
|
Photoconductive cell
|
|
US2621299A
|
|
Flame failure safeguard
|
|
US2541236A
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Electrode mounting device
|
|
US2624812A
|
|
Timing device
|
|
US2579884A
|
|
Flame failure safeguard
|
|
US2624399A
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Program circuit for automatic furnaces
|
|
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Photocell controlled safety system for fuel burners
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|
|
Electrical contactor
|
|
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Flame failure control system
|
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GB630896A
|
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Improvements in flame failure control apparatus
|
|
GB627326A
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Improvements in or relating to burner control
|
|
GB652605A
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Improvements in or relating to flame failure control circuits using thermionic valves
|
|
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Burner safety control system
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Elame failure safeguard
|
|
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Flame failure control apparatus
|
|
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Electromagnetic relay
|
|
GB598538A
|
|
Burner control apparatus
|
|
US2418845A
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Optical safety device
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