"After unloading a truck, the machines check the shipment, report any shortages or overages, and store the materials here," he said, the trace of anger not yet gone from his voice. "When an order is received, it's translated into the catalogue numbers used internally within the plant, and machines like the ones you just saw withdraw the necessary materials from stock, make the component parts, assemble them, and package the finished goods for shipment. Simultaneously, an order is sent to the billing section to bill the customer, and an order is sent to our trucker to come and pick the shipment up. Meanwhile, if the withdrawal of the materials required has depleted our stock, the purchasing section is instructed to order more raw materials. I'll take you through the manufacturing and assembly sections right now, but they're too noisy for me to explain what's going on while we're there." * * * * * Peter followed numbly as Lexington led him through a maze of machines, each one seemingly intent on cutting, bending, welding, grinding or carrying some bit of metal, or just standing idle, waiting for something to do. The two-armed manipulators Peter had just seen were everywhere, scuttling from machine to machine, apparently with an exact knowledge of what they were doing and the most efficient way of doing it. He wondered what would happen if one of them tried to use the same aisle they were using. He pictured a futile attempt to escape the onrushing wheels, saw himself clambering out of the path of the speeding vehicle just in time to fall into the jaws of the punch press that was laboring beside him at the moment. Nervously, he looked for an exit, but his apprehension was unnecessary. The machines seemed to know where they were and avoided the two men, or stopped to wait for them to go by. Back in the office section of the building, Lexington indicated a small room where a typewriter could be heard clattering away. "Standard business machines, operated by the central control mechanism. In that room," he said, as the door swung open and Peter saw that the typewriter was actually a sort of teletype, with no one before the keyboard, "incoming mail is sorted and inquiries are replied to. In this one over here, purchase orders are prepared, and across the hall there's a very similar rig set up in conjunction with an automatic bookkeeper to keep track of the pennies and to bill the customers." "Then all you do is read the incoming mail and maintain the machinery?" asked Peter, trying to shake off the feeling of open amazement that had engulfed him. "I don't even do those things, except for a few letters that come in every week that--it doesn't want to deal with by itself."