Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
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Flame resistant polyurethane foam and the method for manufacturi
Foamable phenolic resin composition and process for preparation
Method for producing phenol resin foams and method of making foa
Method of producing polyurea foams
Microcellular polyurethane elastomer and manufacturing method of
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