US PATENT SUBCLASS 968 / 327
.~ Hermetic sealing of openings, joints, passages, or slits (covers or protecting devices which can be directly removed, or by sliding or turning subclass 300; hermetic sealing of watch or crystal with special pieces subclass 373; hermetically-sealed electrical switches H01H 23/06) [G04B 37/08]


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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}
327.~ Hermetic sealing of openings, joints, passages, or slits (covers or protecting devices which can be directly removed, or by sliding or turning subclass 300; hermetic sealing of watch or crystal with special pieces subclass 373; hermetically-sealed electrical switches H01H 23/06) [G04B 37/08] {6}
328  DD  .~.~> Complete encasings for wrist or pocket watches also comprising means for hermetic sealing of the winding stem and crown (hermetic sealing of the stem or crown subclass 339) [G04B 37/08B] {2}
331  DD  .~.~> Complete encasings for wrist or pocket watches without means for hermetic sealing of winding stem or crown [G04B 37/08C] {2}
334  DD  .~.~> Of the bottom of wrist or pocket watches [G04B 37/08K] {2}
337  DD  .~.~> Protection of wrist or pocket watch cases against dust [G04B 37/08M]
338  DD  .~.~> Means affording hermetic sealing inside the case, e.g., protective case for the clockwork against dust, the escapement being in a hermetically sealed case, etc. (case for watch pieces subclass 305; synchronous motor lubrication subclass 563) [G04B 37/08P]
339  DD  .~.~> Of winding stems (construction of winding crowns subclass 24; in combination with hermetic sealing subclass 328) [G04B 37/10] {2}