1963

In 1963 LEGO finally discontinued use of the original Cellulose acetate plastics in the production of LEGO bricks, in favor of the more stable acrylonitrile butadiene styrene (ABS) plastic. Also, in a continued international push, LEGO Austria was established.

Also in 1963, LEGO created Modilex. Modulex was a variation on the LEGO building system designed for professional architectural modelling. It was manufactured by LEGO from 1963–1965. Modulex was intended for architectural modelling and consisted of a range of bricks, slopes, tiles, baseplates, windows and letter tiles based on the 5mm cube and intended for 1:20 scale building (hence the name M20). The system also included several unusual items, such as baseplate foil, a foil comb and cutter, even solvent-based glue. The early elements were molded by LEGO and had the familiar LEGO logo on the studs. Later elements had a simple 'M' for Modulex on the studs. In 1963 LEGO create a few sets based on Modulex called Hobby and Model Box sets 750/751/752. LEGO created a separate company called Modulex A/S.