CPC Subgroup
H05B 39/04 Controlling
Full Title
Circuit arrangements or apparatus for operating incandescent light sources (structurally associated with the incandescent lamps H01K1/62) > Controlling
3 direct subcodes
Child Classifications
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- H05B 39/06 Switching arrangements, e.g. from series operation to parallel operation
- H05B 39/08 by shifting phase of trigger voltage applied to gas-filled controlling tubes