US PATENT SUBCLASS 968 / 969
.~ At preselected times, e.g., alarm clocks, etc. [G04G 13/02]


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968 /   HD   HOROLOGY

968  DD  PRODUCING ACOUSTIC TIME SIGNALS [G04G 13/00] {1}
969.~ At preselected times, e.g., alarm clocks, etc. [G04G 13/02] {4}
970  DD  .~.~> Details [G04G 13/02A] {1}
972  DD  .~.~> Acting only at one preselected time [G04G 13/02B]
973  DD  .~.~> Acting at a number of different times [G04G 13/02C]
974  DD  .~.~> Combined with a radio [G04G 13/02D]