US PATENT SUBCLASS 423 / DIG 33
MTW; e.g., ZSM-12, NU-13, Czh-5, TPZ-3
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June, 1999
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423 /
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CHEMISTRY OF INORGANIC COMPOUNDS
DIG 33
MTW; e.g., ZSM-12, NU-13, Czh-5, TPZ-3