| http://www.w3.org/ns/prov#value | - a stopping piece 4 of the inside arm 2 is stopped at the front end side end portion of a slot 3 of the outside arm 1.In the specification herein, the right side in each drawing except FIG. 4 is referred to as the front end side, and the left side is referred to as the rear end side.As shown in FIG. 2, the outside arm 1 is formed in a quadrangular tube by joining face to face two metal plates folde
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