US PATENT SUBCLASS 423 / DIG 28
LTL; e.g., Ba-g, L, AG-1, AG-2, AG-4, Ba-6
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June, 1999
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423 /
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CHEMISTRY OF INORGANIC COMPOUNDS
DIG 28
LTL; e.g., Ba-g, L, AG-1, AG-2, AG-4, Ba-6