US PATENT SUBCLASS 368 / 48
.~ With auxiliary power source

Current as of: June, 1999
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368 /   HD   HOROLOGY: TIME MEASURING SYSTEMS OR DEVICES

46  DF  PLURAL TIMEPIECE SYSTEM OR SYSTEM DEVICE (E.G., PRIMARY OR SECONDARY CLOCKS) {5}
48.~ With auxiliary power source

DEFINITION

Classification: 368/48

With auxiliary power source:

(under subclass 46) Subject matter wherein the main power source for the system is replaced by an emergency power source in event of main power source failure.