Image: Analogue control loop evolution
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Description: Showing the evolution of analogue control loop signalling from the pneumatic era to the electronic era.
Title: Analogue control loop evolution
Credit: Own work
Author: Dougsim
Usage Terms: Creative Commons Attribution-Share Alike 4.0
License: CC BY-SA 4.0
License Link: http://creativecommons.org/licenses/by-sa/4.0
Attribution Required?: Yes
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