Konstruktionsbygglåda "JUNIOR"

This system looks just like the German "Trix", but the holes are slightly further apart (pitch=5/16 or 8mm) and smaller (3 mm). All parts are crome plated and the thread is 1/8". The models shown below are identical to "Trix". I´m not sure this is a Swedish system, but I think so. Does anyone know ? Box #3 is a complement to #1 and #2. The roundabout takes 6 boxes of #1, 6 of #2 and 2 of #3.