US PATENT SUBCLASS 968 / 605
CLOCKS WITH ATTACHED OR BUILT-IN MEANS OPERATING ANY DEVICE AT PRESELECTED TIMES OR AFTER PRESELECTED TIME INTERVALS (if restricted to producing acoustic time signals by electrical means subclass 580; mechanical alarm clocks subclass 231; apparatus which can be set and started to measure off predetermined intervals subclass 815; time or time-program switches which automatically terminate their operation after the program is completed H01H 43/00) [G04C 23/00]

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968 /   HD   HOROLOGY

605CLOCKS WITH ATTACHED OR BUILT-IN MEANS OPERATING ANY DEVICE AT PRESELECTED TIMES OR AFTER PRESELECTED TIME INTERVALS (if restricted to producing acoustic time signals by electrical means subclass 580; mechanical alarm clocks subclass 231; apparatus which can be set and started to measure off predetermined intervals subclass 815; time or time-program switches which automatically terminate their operation after the program is completed H01H 43/00) [G04C 23/00] {3}
606  DD  .~> Constructional details [G04C 23/02] {5}
612  DD  .~> Mechanisms continuously running to relate the operation(s) to the time of day [G04C 23/14] {4}
627  DD  .~> Mechanisms measuring a chosen time interval independently of the time of day at which interval starts [G04C 23/38] {4}