US PATENT SUBCLASS 423 / DIG 37
LEV; e.g., Levynik, ZMT-45, ZK-20, NU-3, LZ-132, LZ-133
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423 /
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CHEMISTRY OF INORGANIC COMPOUNDS
DIG 37
LEV; e.g., Levynik, ZMT-45, ZK-20, NU-3, LZ-132, LZ-133