US PATENT SUBCLASS 968 / 631
.~.~.~ With provision for adjustment of the interval (subclass 630 takes precedence) [G04C 23/46]


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968 /   HD   HOROLOGY

605  DD  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] {3}
627  DD  .~ Mechanisms measuring a chosen time interval independently of the time of day at which interval starts [G04C 23/38] {4}
629  DD  .~.~ Acting only at the end of a single time interval [G04C 23/42] {2}
631.~.~.~ With provision for adjustment of the interval (subclass 630 takes precedence) [G04C 23/46]