| http://www.w3.org/ns/prov#value | - A vacuum source can be attached to the evacuation port 7306 and a suitable gas source, such as nitrogen or a blend of gases including argon, carbon dioxide, nitrogen and a quantity of oxygen that does not exceed 5% and is not less than 1000 PPM, or any combination thereof, can be attached to the gas entry port 7308 and thereby providing a continuous flow of gas through the tube 7300 from port 7308
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