US PATENT SUBCLASS 968 / 968
PRODUCING ACOUSTIC TIME SIGNALS [G04G 13/00]

Current as of: June, 1999
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968 /   HD   HOROLOGY

968PRODUCING ACOUSTIC TIME SIGNALS [G04G 13/00] {1}
969  DD  .~> At preselected times, e.g., alarm clocks, etc. [G04G 13/02] {4}