US PATENT SUBCLASS 968 / 158
.~.~ Shiftable dials, e.g., indicating alternately from 1 to 12 and from 13 to 24, etc. (dials with a scale other than the normal 12 hour scale subclass 151) [G04B 19/16]


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968 /   HD   HOROLOGY

139  DD  INDICATING BY VISUAL MEANS (by electric lamps subclass 576; indicating by acoustical means mechanically subclass 217, electrically subclass 580; acoustic signals at preselected times mechanically subclass 229, electrically subclass 580; optical time signals at preselected times mechanically subclass 244, electrically subclass 577; continuous time indication by electric means subclass 564; visible signalling arrangements G08B 5/00) [G04B 19/00] {10}
147  DD  .~ Dials (for time-pieces without clockwork subclass 416; moving discs subclass 162; illuminated dials or hands subclass 213) [G04B 19/06] {8}
158.~.~ Shiftable dials, e.g., indicating alternately from 1 to 12 and from 13 to 24, etc. (dials with a scale other than the normal 12 hour scale subclass 151) [G04B 19/16] {2}
159  DD  .~.~.~> Numbers which are visible alternately from 1 to 12 and from 13 to 24 on the same dial [G04B 19/16B]
160  DD  .~.~.~> With rotating scales [G04B 19/16C]