What was the first computer program for CAD?

Advances in programming and computer hardware, most notably solid modeling in the 1980s, have allowed more versatile applications of computers in design activities. In 1981, the key products were the solid modeling packages— Romulus (ShapeData) and Uni-Solid (Unigraphics) based on PADL-2—and the surface modeler CATIA ( Dassault Systemes ).
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