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Patents
Organic compounds -- part of the class 532-570 series Patents (Class 549)
Organic Compounds -- Part Of The Class 532-570 Series Patents (Class 549)
Organic compounds (class 532, subclass 1)
HETEROCYCLIC CARBON COMPOUNDS CONTAINING A HETERO RING HAVING CHALCOGEN (I.E., OXYGEN, SULFUR, SELENIUM, OR TELLURIUM) OR NITROGEN AS THE ONLY RING HETERO ATOMS (Class 540, subclass 1)
Foreign Patent Art Collections
Class-related foreign documents (Class 549/FOR000)
