| http://www.w3.org/ns/prov#value | - clamp, which keeps the two boiler tubes in alignment so that the remainder of the welding may be completedOnce again another object of the present invention is to provide a boiler tube welding clamp that does not require any devices other than the supplied U-shaped bolts and a tool to tighten the nuts on said bolts to make it work.In brief, a boiler tube clamp device for clamping together and alig
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