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isa:356935612
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Referring now to the drawings and in particular to Fig. l, the constructional element comprises an angle bar of right-angle section having in each of its equal limbs or flanges 1 and 2 a row of chevron shaped slots spaced at constant pitch and centred symmetrically on the long axis of each limb. 7 2i} and; the underlying slots 4 and 5 of bar 21.
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isap:233839145
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isa:356935612