Patent classifications
G
PHYSICS
Load children
G05
CONTROLLING; REGULATING
Load children
G05D
SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
Load children
G05D16/20
characterised by the use of electric means
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G05D16/2093
with combination of electric and non-electric auxiliary power
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G05D16/2097
using pistons within the main valve
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