Quoted from Mr_Tantrum:The other favorite toy I remember during my childhood in the 70's was a skyscraper building set. It came with plastic beams, girders, and panels to cover the exterior. I remember building skyscrapers that were 4 or 5 feet tall. My first set was the Sears Tower set, and then I added onto it. I came across this wiki page detailing them: https://en.wikipedia.org/wiki/Girder_and_Panel_building_sets
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Girder and Panel - probably the reason I am an engineer.
Don C.