The initial development of poker machines began in a small heavy dental equipment factory in Sydney. An engineer saw that the machinery could be used to manufacturer poker machines. He alerted the owner, Len Ainsworth, who researched the idea and discovered the market potential for gaming machines.

The gaming machine industry at that time was undersupplied and there was a strong demand. In 1954, Len Ainsworth founded the business that became Aristocrat*. For many years Len Ainsworth remained its Managing Director, Chairman and controlling shareholder.

In 1956 the legalization of the poker machine in New South Wales led to an expansion of the market. Poker machines manufactured by Len Ainsworth were in demand. His gaming machines were popular, renowned for their innovative designs, features and games.

By the early 1960's there were 1500 clubs in Australia. Len Ainsworth decided to enter this market, utilising his renowned experience and reputation.

By the 1980’s Ainsworth's company, had become the dominant player in the Australian poker machine industry.

During the 1990's the gaming machine industry experienced rapid growth. This was due to a relaxation of the laws in New South Wales. As a consequence, clubs and hotels could retain licenses for poker machines. This led to an expansion of the gaming machine industry from $14.52 billion in 1990/91 to $66.04 billion in 1998/99.