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аннулирование патента stresses
dipl.	repeal of a patent
EBRD	nullification of a patent
econ.	abatement of a patent; annulment of a patent; revocation of a patent
patents.	avoidance of patent; cancellation of patent; abatement of patent; invalidation of patent; nullification of patent; revocation of patent

аннулирование патента: 8 phrases in 3 subjects

Business	1
General	1
Patents	6