| http://www.w3.org/ns/prov#value | - In the composite member 6, insides of the concave grooves 2 and the core material through-holes 3 of the core material 1 are filled with the covering materials 5 each composed of aluminium or aluminium alloy, and these covering materials 5 can be removed by cutting process using a common cutting tool such as an end mill.
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