| http://www.w3.org/ns/prov#value | - The following is a description, with reference to FIGS. 6A and 6B, of a preferred method for joining plate-like members 2, 3 made by injection-molding from a plastics, more particularly PMMA. FIGS. 6A and 6B show the plate-like members 2, 3 in the state respectively before and after joining by ultrasonic welding.
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