US PATENT SUBCLASS 968 / 229
ARRANGEMENTS PRODUCING ACOUSTIC SIGNALS AT PRESELECTED TIMES (optical time indicating subclass 139, 564, and 577; indicating by acoustic means subclass 217; indicating time by means other than acoustic or optical or by a combination of means subclass 243; acoustic time signals produced electrically subclass 580; coin-freed alarm clocks G07F 17/00B; acoustic signalling means G08B 3/00) [G04B 23/00]

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968 /   HD   HOROLOGY

229ARRANGEMENTS PRODUCING ACOUSTIC SIGNALS AT PRESELECTED TIMES (optical time indicating subclass 139, 564, and 577; indicating by acoustic means subclass 217; indicating time by means other than acoustic or optical or by a combination of means subclass 243; acoustic time signals produced electrically subclass 580; coin-freed alarm clocks G07F 17/00B; acoustic signalling means G08B 3/00) [G04B 23/00] {2}
230  DD  .~> By starting up musical boxes or other musical recordings (starting up and stopping of phonographs by means of clockwork apparatus G11B 33/06) [G04B 23/00B]
231  DD  .~> Alarm clocks (electrically released alarm signals subclass 580; waking up by electric lamps subclass 578; by other means subclass 244; alarm clocks with electric contacts subclass 608) [G04B 23/02] {11}