71571744
Jan 6, 1949
Sep 11, 1951
SYNTHETIC RUBBER, PARTICULARLY ISOBUTYLENE/ISOPRENE COPOLYMERS OR BUTYL RUBBER, BUTADIENE/STYRENE COPOLYMERS OR BUNA S OR GR-S SYNTHETIC RUBBER, AND BUTADIENE-ACRYLONITRILE COPOLYMERS OR GR-A SYNTHETIC RUBBER
Chemicals