Improved tongue and groove construction, characterized in that the assembly of the male and female longitudinally determine a channel, while. the incoming and outgoing of both constitute a double tongue and groove; the female is constituted by a rectangular prismatic body that presents centrally a rectangular groove determined by two tongues, one superior with its upper edge chamfered, and another inferior, and shorter; the male, also constituted by a rectangular prismatic body, centrally presents a tongue determined superiorly by a recess with its upper edge chamfered and inferiorly by another shorter and shallower recess, determining longitudinally the assembly of both parts by its outer face, a channel triangular. (Machine-translation by Google Translate, not legally binding)
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