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Diamine novel acid dianhydride and novel polyimide...

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From ketone or ketene reactant
Reexamination Certificate

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Dyed polyesters, process for their preparation and their use for

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From ketone or ketene reactant
Patent

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