Automation System
The computer graphics system called SKETCHPAD was demonstrated at

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

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Automation System
Stepping motors:

do not require commutators
can run both clockwise and counterclockwise
All of these
can be built to index different amounts by changing the pole configuration
can run at varying speeds

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