Patent classifications
G
PHYSICS
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G05
CONTROLLING; REGULATING
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G05D
SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
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G05D23/01
without auxiliary power
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G05D23/02
with sensing element expanding and contracting in response to changes of temperature
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G05D23/021
the sensing element being a non-metallic solid, e.g. elastomer, paste
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