The Thinking Machine by Raymond F. Jones - https://www.gutenberg.org/cache/epub/78681/pg78681-images.html

 

Each machine is interconnected with all others in the nation by tremendous microwave cables. A main clearing panel located somewhere in Kansas links the function of all local machines to a central, coordinating unit.

“In addition, there is a worldwide network of interconnections between New York, London, Paris, Rome, and Moscow. It even extends to Africa and the cities of Central Asia. Actually, for instance, a Mech, First Rating, could be checked out for pairing against a South African native if the Machine so decided. It’s never happened as far as I know. But it could happen.”