Note: the text below was taken from the Wikipedia article on the same subject.

Williams is a long-standing American electronic gaming and amusement company based in Chicago, Illinois. Williams was founded as the Williams Manufacturing Company in 1943 by Harry E. Williams. Williams initially was a manufacturer only of pinball tables. In the early 1970s, Williams branched out into the fledgling coin-operated arcade video game market, where it was successful for many years.