Portable Commutator
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The Portable Commutator was a telecommunications device that was used by the military during World War I. It was manufactured by Northern Electric Company.{{cite web |url=https://www.thecanadianencyclopedia.ca/en/article/nortel |title=Nortel |author=Douglas Hunter |date=January 5, 2018 |access-date=February 15, 2021 |publisher=The Canadian Encyclopedia}} It was used as a one-wire telegraphic switchboard.{{cite web |url=https://www.microwavejournal.com/articles/17532-goliath-s-fall |title=Goliath's Fall |date=May 15, 2012 |access-date=February 15, 2021 |author=Savid Vye |publisher=Microwave Journal}}
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