Description: 968 horology / 968 horology/(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] (231) 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] (241) with pre-signal; with repeated signal; with changeable intensity of sound [g04b 23/10]
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