| http://www.w3.org/ns/prov#value | - Further, as shown in FIG. 4, if the vol % of the helium gas is higher than 25 vol %, even if a diaphragm damper passes the gas leakage test after welding, the gas charged in the high pressure chamber would tend to leak over time along with use for a long period such as 10 years and the pressure Px of the mixed gas would end up falling to below the reference pressure Px with respect to the initial
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