| 摘要 |
A U-shaped body including spaced apart generally parallel opposite side legs joined at one pair of corresponding ends by a generally semi-circular bight portion whose opposite ends merge smoothly into the adjacent leg ends. The legs are slightly convergent toward the other end thereof and include enlarged slightly angulated terminal end portions which parallel each other. The enlarged terminal ends of the legs are provided with aligned oval bores whose major dimensions extend in the plane of the U-shaped body and a pin which is oval in cross-section is removably secured through the bores.
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