US PATENT SUBCLASS 968 / 303
.~ With means to enhance sound transmission (sonorous means for chimes subclass 225; for alarm clocks subclass 237; clockworks combined with musical devices subclass 405) [G04B 37/00J]

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968 /   HD   HOROLOGY

294  DD  CASES (cases with a special shape subclass 390; ornamentation of the case subclass 395; cartridges A45C 11/00-11/38) [G04B 37/00] {13}
303.~ With means to enhance sound transmission (sonorous means for chimes subclass 225; for alarm clocks subclass 237; clockworks combined with musical devices subclass 405) [G04B 37/00J]