| 摘要 |
A construction element of the multiple tooth or nail type in which the long, narrow teeth are arranged in pairs, each tooth of each pair projecting in the same general direction substantially perpendicularly from a plate, being integral with the plate and being formed on one lateral edge only with a spur extending generally toward the mating tooth and with a relief region between the spur and the tooth base, the teeth being longitudinally dished in their facing surfaces and being twisted in a common direction so that the spurred edge of each tooth is advanced toward its mating tooth.
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