A set of elements for constructing toy devices includes a basic clothes-pin type part or clamping element which comprises first and second arms which are pivoted together by a ball-shaped formation on one which extends into a socket formation on the other end which are held together in a pivoted formation. A V-shaped spring is formed inwardly between one of the common ends of the adjacent arms and the opposite ends form clamping jaws. The clamping element includes at least one opening at each arm to permit passage of a rod-shaped structural element therethrough, and in addition, the V-shaped spring part is formed with a round apex to facilitate engagement over a similar rod-shaped element at this location. The clamping jaws may be sprung open to engage over a rod-shaped member or similar structural element. Advantageously the arms each includes an opening in a side or an end or top face or both so that they may be connected to a rod-shaped member on the side, ends or top. If desired, the ball-shaped projection on one of the arms can be lifted out of the socket-shaped part of the arm so that the arms are held spread apart by the V-shaped spring connecting their one ends. A very large number of interengagement possibilities may be obtained with the basic structures combined with one or more additional type toy building structures.
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