This clamp, during welding in order to operate the metallic plate 2 or more, includes the substance which has the stationary type arm because those metallic plates are locked and the arm of working, as for the feature, in order to support the joint arm, the substance consists of the central tubular part where 2 side plates which in order in addition to induce the operation rod of the same arm face mutually were welded in lower part, between the support side plates of the joint axis, it is to have 1 these joint arms which are arranged in the central part of clamp set.
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