Automation System
Pressure sensors:

use capacitive variations to sense pressure
All of these
use the piezoresistive effect in strain gauge sensors
None of these
use an aneroid chamber with a variable resistance output

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Automation System
The SKETCHPAD system

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

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