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国际专利分类表
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国际专利分类表
Encyclopedia
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《国际专利分类表》
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International Patent Classification
《国际专利分类表》
用于专利文献分类的等级列举式分类法。简称IPC。
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four elderly hermits of mount Shang
four-electrode potentiostat
four element in site management
four-element intersection structure theory
four elements
Four Essays on Liberty
four exponentials conjecture
four-eye fish
four famous Dan actors
four famous young female role performers
four fermion effective interaction theory
four-figure integer
four flow conjecture
four-flow conjecture
fourfold
fourfold axis
fourfold classification
fourfold knot
fourfold [symmetry] axis
fourfold symmetry axis
fourfold table
four-force
four forms
four forms of law of the Song Dynasty
four fractions
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