| http://www.w3.org/ns/prov#value | - Examples of the material used for the rigid inner die 1 include metals such as aluminum and aluminum alloy.The split parts 2 are operatively attached to peripheral edge portions of support plates 5a and 5b via rotational mechanisms 3, respectively, so as to form a cylindrical shape, the support plates 5a and 5b each formed in a disc-like shape and facing the other.
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