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Old 06-06-2017, 10:15 PM
LSLGuy LSLGuy is offline
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Join Date: Sep 2003
Location: Southeast Florida USA
Posts: 21,035
The total effort to create the conventional telephone system dwarfs al the others mentioned up-thread.

Then we built the internet alongside it.

A lot of these two systems' claim to fame is simply their raw volume. But I'd argue that quantity has a quality all its own.

To be sure the OP's raw question is unanswerable until we can define what "highly engineered" means. Greatest amount of bleeding-edgeness as measured by our interdisciplinary bleed-o-meter? Greatest parts count? Greatest gross weight? etc.