Improvements in or relating to constructional elements

摘要: 715,652. Joining structural elements. FISHER & LUDLOW, Ltd. March 17, 1953 [March 1952], No. 6785/52. Class 20 (2) A constructional element for building up structures such as frames, racks, stands and girders including box girders, wherein an elongated strip, or at least one web of angle form in cross section, is formed with three parallel longitudinal rows 12, 13, 14 longitudinally holes, the length holes substantially greater than distance between adjacent each row, row staggered relation to other two rows, arrangement being that may be secured overlapping face relationship a similarly apertured by bolts fastening means passing through registering elements whole all possible relative angular positions elements, bolt means. The perpendicular edges equal longitudinaly spacing row. narrow 11 have single 15 similar 13 14.