| http://www.w3.org/ns/prov#value | - A process according to claim 37, wherein the noncombustible gas is composed mainly of an inert gas selected from the group consisting of nitrogen, helium, and argon, said non-combustible gas containing at least one member selected from the group consisting of 0.0l-S percent by volume of acetylene gas, at least 0.] percent by volume of Liquefied Petroleum Gas, and at least 0.1 percent by volume of
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