Beginning in 1988, GE sold Calma. The electronic side of the business was sold to Valid Logic Systems in April 1988. (Valid in turn was acquired by Cadence Design Systems in 1991). The remainder of the business (mechanical/architectural) was acquired by Prime Computer in a sale completed in January 1989. Prime had just completed a hostile take-over of Computervision. Prime basically merged the Calma Mechanical and AEC product lines with Computervision. Computervision, including the Dimension III product, was acquired by Parametric Technology Corporation in 1998.