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
Foams from phenolic resins and isocyanates, and process for the
Organomineral products from aqueous alkali metal silicate, polyi
Organomineral products, a process for their manufacture and thei
Organomineral products, a process for their manufacture and thei
Process and device for the continuous production of plates from
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