The connection element according to the present invention includes a central strip and two hook strips issuing from it that together form a claw strip with C-shaped cross section. The ends of the hook strips point toward each other, and with their ends, define an open jaw. Additionally, the extended central lines of the ends of the hook strips intersect outside the open jaw. Extending from the claw strip is at least one connection strip that possesses a straight neck strip and a head strip that is oval in cross section. The major axis of the oval head strip is perpendicular to the longitudinal axis of the neck strip.

 
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