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The Blue Machine (early 70's):

This predated the 2200 desk-style cabinet. It was 100% hardware, using thumbwheel setpoints, and mechanical counters for reporting inventory.

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This was Flowcon's first batch controller:

Having established a nitch with a PID setpoint controller for flow control, the need for a batch control system became evident. "Software" being a foreign concept to most companies, the approach was totally hardware.

In the late 70's, controller processors allowed for a software driven solution, which led to the model 2200 "desk-style" batch system.

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