US PATENT SUBCLASS 968 / 370
.~ From a material other than glass [G04B 39/00C]

Current as of: June, 1999
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968 /   HD   HOROLOGY

368  DD  WATCH CRYSTALS; FASTENING OR SEALING OF CRYSTALS; CLOCK GLASSES [G04B 39/00] {4}
370.~ From a material other than glass [G04B 39/00C] {1}
371  DD  .~.~> Out of wear resistant material, e.g., sapphire, etc. [G04B 39/00C2]