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Test machine theory is also supported by the fact that they are in Chicago, where Midway is/was based.

That's right. Bally/Midway left the city for the suburbs during the boom years, with offices in Rosemont and factories in Franklin Park and Bensenville.

The Franklin Park factory is actually still in use. It now makes equipment for Life Fitness, which has a historical tie back to Bally.

Here's the factory back in 1982: https://www.youtube.com/watch?v=62s_BIYg5Gs

And today: https://www.youtube.com/watch?v=2UUpzCJaNrQ

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