US PATENT SUBCLASS 968 / 364
.~ Materials or processes of manufacturing pocket watch or wrist watch cases (machines or tools for the manufacture of clockwork cases subclasses 709, 710, and 734; decoration or tools therefor subclass 391) [G04B 37/22]

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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}
364.~ Materials or processes of manufacturing pocket watch or wrist watch cases (machines or tools for the manufacture of clockwork cases subclasses 709, 710, and 734; decoration or tools therefor subclass 391) [G04B 37/22] {2}
365  DD  .~.~> Wear resistant cases [G04G 37/22D]
366  DD  .~.~> Nonmetallic cases (subclass 365 takes precedence) [G04B 37/22K] {1}