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Additional facts edit
An article in The Wall Street Journal, January 18-19, 2020, pg A10, has some interesting facts:
Invented by Gary Starkweather, with Butler Lampson and Ron Rider, starting in the "late 1960s" and released in 1977. Sold for $295,000. Dsm (talk) 17:34, 24 January 2020 (UTC)