US PATENT SUBCLASS 252 / FOR 253
.~.~ Titanium or zirconium compound (252/520)

Current as of: June, 1999
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252 /   HD   COMPOSITIONS

*  DD  FOREIGN ART COLLECTIONS {1}
FOR 251  DD  .~ Metal compound containing (252/518) {3}
FOR 253.~.~ Titanium or zirconium compound (252/520)