| http://www.w3.org/ns/prov#value | - welded and adjustable aligning and retaining means spaced from said clamping means for precisely positioning the surface of the workpiece held thereby, said housing including means for moving the clamping assembly relative to the housing and for applying a closing force to the surfaces being welded during the welding operation and dur-4 relative thereto, said clamping ing movement of the housing
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