Automation System
Digital signals:

have a frequency measured in units of hertz
None of these
are assigned values of 1 or 0 depending on the voltage level
can have three possible levels
have a sinusoidal shape.

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Automation System
The computer graphics system called SKETCHPAD was demonstrated at

University of Aston, Birmingham, 1960
Massachusetts Institute of Technology in 1963
None of these
Cranfield Institute of Technology, London, 1962
Imperial college of Science and Technology, London, 1973

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