| http://www.w3.org/ns/prov#value | - Out of these elements extensive rigid structures can be built. 8 Claims, 13 Drawing Figures PATENTEDncI 17 m2 SHEET 1 OF 3 INVENTOR. CARL R. HE LDT PATENTEDucI 17 I972 3.698.123 sum 2 (IF 3 INVENTOR. CARL R. IHELDT BY Mag g P'A'TENTEDum 11 I972 SHEET 3 0F 3 INVENTOR. CARL R. HELDT BE BACKGROUND OF THE INVENTION This invention relates to toys and particularly to construction toy sets composed of bu
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