| http://www.w3.org/ns/prov#value | - Tests have shown that the appliances fitted with threaded assembly head as shown in FIG. 1, or with the flanged and welded joint are functionally correct, the material encased in the tank is removed completely and it is free from contamination, and they are suitable for refilling either with the same or different materials, particularly in case of the alternative shown in FIG. 1.
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