| http://www.w3.org/ns/prov#value | - T he above and other objects of invention are accomplished by preparing a blend of rubber containing 10 to parts per 1 ()0 parts by, weight rubber of a synthetic polybutadiene containing at least percent butadiene joined together by cis 1,4 linkage, the remainder being chiefly a cisp olyisoprene, i.e,, natural rubber or a synthetic cis-polyisoprene containing at least 75 percent isoprene joined to
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