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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G05D16/04
without auxiliary power
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G05D16/10
the sensing element being a piston or plunger
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G05D16/107
with a spring-loaded piston in combination with a spring-loaded slideable obturator that move together over range of motion during normal operation
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