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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active
Rigid polyurethane foam and heat insulator obtained therefrom
Rigid polyurethane foam and process for producing the same
Rigid polyurethane foam and process for producing the same
Rigid polyurethane foam and process for producing the same
Rigid polyurethane foam, process for producing the same, and hea
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