| http://www.w3.org/ns/prov#value | - U.S. Pat. No. 6,919,393 to Mano et al. discloses a solid golf ball comprising at least one layer of a core, and at least one layer of a cover formed on the core, wherein at least one layer including the innermost layer of the core is formed by vulcanizing a rubber composition comprising a base rubber, a co-crosslinking agent, a vulcanization initiator and a filler, the core has a center hardness i
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