Coin-Operated Pinball Machines: an historical and technological survey by Herb Jones

I have no idea if this book was ever sold or it was just a present to operators and distributors by Bally.
I got my copy when I bought a lot of manuals from an operator.

This book was published in the early seventies (aruond 1973 ?) by Bally themselves.

It consists of different chapters that go very in detail. First chapter talks about the history of pinball and how it evolved from bagatelle games. How the depression made it possible for pin-games to become popular.
Next chapters talk about the addition of electricity, the evolution of pinball machines and how different components operate. The invention of the thumper bumper, score reels, and much more. Do you know what was the first game to display scoring using lights in the backbox ? Even the psychology of playing pinball is discussed.

It's an interesting book, especially now to look back at how the pinball industry was over 35 years ago.