US PATENT SUBCLASS 315 / 89
.~ Plural substitution of load devices or electrodes

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315 /   HD   ELECTRIC LAMP AND DISCHARGE DEVICES: SYSTEMS

88  DF  AUTOMATIC SUBSTITUTION OF THE LOAD DEVICE OR ELECTRODE {5}
89.~ Plural substitution of load devices or electrodes

DEFINITION

Classification: 315/89

(under subclass 88) Systems in which two or more substitute load devices or electrodes are provided for successive substitution as required.