In field names the narrower specialty an invention sits within inside its wider field. Wikipedia notes a telephone "converts sound... into electronic signals that are transmitted via cables and other communication channels," a specialty of electrical signal transmission inside telecommunications generally. This dimension groups inventions that share the same narrow technical specialty.
Facts
Comparison
Main Engineering Branch Field Founding Era In Field
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Sources
1. Wikipedia: Engineering
WikipediaIntroduction, traditional disciplinesQuote, Introduction, traditional disciplines
The traditional disciplines of engineering are civil, mechanical, electrical, and chemical.
2. Wikipedia: Chemical engineering
WikipediaHistory, term origin, circa 1890Quote, History, term origin, circa 1890
History of Science in United States: An Encyclopedia puts the use of the term around 1890.
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