Automation System
The computer graphics system called SKETCHPAD was demonstrated at

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

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Automation System
Digital signals:

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

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