| 摘要 |
An elongated bracket arm includes a flat upper surface and an arm end wall at substantially right angles to said flat upper surface. A socket is provided in said flat upper surface spaced from the ends of the arm. The end of said socket most closely adjacent said arm end wall is on a plane which slopes downwardly and toward the plane of said arm end wall. A slot normal to the flat upper surface connects the end of the socket to the arm end wall to accommodate a fastening means extending therethrough.
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