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chemistry (69) 69
compositions based thereon (69) 69
metallurgy (69) 69
organic macromolecular compounds (69) 69
their preparation or chemical working-up (69) 69
after-treatment not covered by subclasses c08b, c08c, c08f,c08g (68) 68
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use of inorganic or non-macromolecular organic substances ascompounding ingredients (45) 45
macromolecular compounds obtained otherwise than by reactionsonly involving unsaturated carbon-to-carbon bonds (23) 23
general tagging of cross-sectional technologies spanning over several sections of the ipc (20) 20
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macromolecular compounds obtained by reactions only involvingcarbon-to-carbon unsaturated bonds (1) 1
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