PURPOSE: To effectively seal a monitor test piece together with the air in a space. ;CONSTITUTION: A double sealing structure is formed by press injecting of a press injecting protrusion 6 to a press injecting groove 7 and sealing by a seal ring 8. High sealability between a vessel body 5 and a cover 3 is obtained, and the condition in which a monitor test piece 9 is sealed together with the air without raising to 50°C or higher is achieved.;COPYRIGHT: (C)1996,JPO
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