| 摘要 |
An elongated structural member is erected with one or more similarly formed members. The ends are formed with a pair of angularly disposed chamfers each at a predetermined angle with the longitudinal axis, and having a tenon projection and a corresponding mortise. The tenon and mortise are disposed relative to each other in a respective one of said chambers, at right angles to each other, such that on joining said elements the tenons of one element fit within the mortise of the other element and the chamfered ends abut each other.
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