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US2508478A
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Means for determining electrical resistance values
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US2555166A
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Measuring network utilizing rectified currents
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US2298521A
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Remote positioning means
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US2287459A
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Means for regulating variable conditions
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US2246905A
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Constant speed series wound motor
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US2212760A
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Automatic temperature regulator
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US2224709A
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Pressure measuring means
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US2187369A
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Automatic speed regulator
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US2136809A
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Pressure measuring means
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US2093582A
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Temperature regulator
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US2061884A
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Temperature regulator
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US2109872A
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Temperature control apparatus
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US2022097A
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Recording galvanometer
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US1840546A
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Automatic control device
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US1841559A
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Automatic temperature control device
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US1838336A
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Automatic temperature control device
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US1934388A
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Automatic control apparatus
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US1758416A
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Recording galvanometer
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US1841558A
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Recording potentiometer
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US1887827A
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Thermocouple and its electrical connection
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