How do fax machines work? – Livescience.com

Like a cross between a telephone and a printer, fax machines copy documents in one location and print them out in another even thousands of miles apart. Before the ubiquity of computers and high-speed internet and when the other options were snail mail or a courier, a fax could relatively quickly transmit medical records to doctors, photos to newspapers and invoices to clients. But how do fax machines work?
“Basically, a fax machine scans an image or a document line by line, then transmits that…

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