Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
Inventor
active
Elastic polyurethane fiber
Polyamide copolymers
Polyamide copolymers
Polyester urethane fiber: polyester made from methyl pentane dio
Polyurethane, elastic polyurethane fiber and polyesterpolycarbon
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