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US5085574A
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Fail-safe valve relay driver circuit for gas burners
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US4955806A
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Integrated furnace control having ignition switch diagnostics
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US5017741A
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Rotary digital contact encoder substrate
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US5007159A
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Method of manufacturing an electrical component, e.g. a digital contacting encoder
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US4927490A
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Method of manufacturing an electroluminescent display
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US4874430A
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Composite silver base electrical contact material
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US4845839A
|
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Method of making a resistive element
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US4827769A
|
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Fuel level sensor with buried conductor
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US4939455A
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Sensor having two-wire connection to load
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US4894613A
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Inductive speed sensor having switching hysteresis for increasing the magnitude of a phase shift
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US4947116A
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Inductive speed sensor employing phase shift
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US4839558A
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Integrated DC electroluminescent display system
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US4834939A
|
|
Composite silver base electrical contact material
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US4865538A
|
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Fail safe gas valve drive circuit
|
|
US4828484A
|
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Gas valve relay redundant safety
|
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US4832594A
|
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Control system with timer redundancy
|
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US4872828A
|
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Integrated furnace control and control self test
|
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US4842510A
|
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Integrated furnace control having ignition and pressure switch diagnostics
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US4791258A
|
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Sealed enclosure for electrical circuitry in moist environment
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US4846912A
|
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Method of insulating a coil
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