| http://www.w3.org/ns/prov#value | - When an oil such as silicon oil is charged, for example, an oil inlet 19a is formed on the sealing plate consisting of an acrylic resin 18, as shown in FIG. 9A, and after the oil is charged, the oil inlet 19a is heated while being plugged with an inlet sealing pin 19b, whereby the oil inlet 19a and the inlet sealing pin 19b are welded together, as shown in FIG. 9B, and sealing is facilitated.
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