US PATENT SUBCLASS 968 / 217
INDICATING BY ACOUSTIC MEANS (at preselected times subclass 229; by electroacoustic means or electroacoustic time indicating subclass 582; time indicating by means other than acoustically, or combined means subclass 243; time indicating by visual means subclass 139; acoustic signalling arrangements G08B 3/00) [G04B 21/00]

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968 /   HD   HOROLOGY

217INDICATING BY ACOUSTIC MEANS (at preselected times subclass 229; by electroacoustic means or electroacoustic time indicating subclass 582; time indicating by means other than acoustically, or combined means subclass 243; time indicating by visual means subclass 139; acoustic signalling arrangements G08B 3/00) [G04B 21/00] {2}
218  DD  .~> Periodical acoustic signalling arrangements (subclass 219 takes precedence); (adjustment of the frequency by setting the length of the pendulum subclass 115) [G04B 21/00B]
219  DD  .~> Regular striking mechanisms giving the full hour, half hour, or quarter hour [G04B 21/02] {8}