Status records whether an engineered system is still actually operating. Wikipedia notes Hoover Dam "impounds Lake Mead" and remains "a major tourist attraction, with 7 million tourists a year," very much in active use today. This dimension separates systems still running from those retired or demolished.
Facts
Comparison
Main Engineering Branch Field Founding Era Status
Sources
1. Wikipedia: Engineering
WikipediaIntroduction, traditional disciplinesQuote, Introduction, traditional disciplines
The traditional disciplines of engineering are civil, mechanical, electrical, and chemical.
2. Wikipedia: Electrical engineering
WikipediaIntroduction, emergence as an occupationQuote, Introduction, emergence as an occupation
It emerged as an identifiable occupation in the latter half of the 19th century after the commercialization of the electric telegraph.
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