| http://www.w3.org/ns/prov#value | - On the other hand, if the thickness of the polyimide sheet layer exceeds 50 .mu.m, flexibility of the hinge board obtainedtends to be lowered and reduction in thickness of the board tends to be difficult.The conductor layer according to the present invention is a layer formed by forming a circuit in a conductor film laminated on both sides or one side of the polyimide sheet layer.
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