CPC Subgroup
H01T 13/24 having movable electrodes (H01T13/28 takes precedence)
Full Title
Sparking plugs > characterised by features of the electrodes or insulation > having movable electrodes (H01T13/28 takes precedence)
1 direct subcode
Child Classifications
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- H01T 13/26 for adjusting spark gap otherwise than by bending of electrode