Back in the late 70s / early 80s, I thought I would write a book on the history of pinball in Australia. I wrote to Gottlieb, Williams, Stern and Bally (see replies below) and began collecting bits and pieces (newspaper articles, etc) that I thought I might use.
Around that time, pinball was getting some bad press. My local council even thought about banning machines. I began a defence against this and ended up on the front page of the local paper.
The oldies amongst the AP members might find this stuff of interest.