| http://www.w3.org/ns/prov#value | - The cylinder 70 is lined with refractory material such as graphite or carborundum as in dicated at 71 and reciprocating within the cylinder is a metal piston 72 havin an outer 80 acket 7 3 of refractory material. passage 4i is provided in one wall of the cylinder to permit filling, with molten metal.
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