Automation System
The SKETCHPAD system

None of these
consisted of an cathode-ray oscilloscope driven by a Lincoln Tx2 computer where by graphical information was displayed on the screen.
All of these
is used for interactive Graphics
is expensive because it is sophisticated and make demands on the power and resources of the computer.

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Automation System
Programmable controllers:

None of these
are widely used in many different industries
cannot perform functions other than relay logic
(a) and (c) above
are programmed using relay ladder logic

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