Automation System
The concept of a general CAD system was that it should provide:

A set of basic system functions and utilities.
A system for the operation of applications programming.
A system for handling user actions.
All of these
None of these

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Automation System
Light sensors:

never use infrared light as light source
cannot be used a s limit switches.
None of these
work in direct sunlight
come in a wide variety of mounting styles

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