CPC Subgroup
F23N 5/20 with a time program acting through electrical means, e.g. using time-delay relays
Full Title
Systems for controlling combustion (regulating fuel supply F23N1/00, regulating air supply or draught F23N3/00) > with a time program acting through electrical means, e.g. using time-delay relays
2 direct subcodes
Child Classifications
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