1961 IBM Selectric typewriter with its unique ball-type typing element.
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Previously:
https://www.homemadetools.net/forum/...711#post151975
https://www.homemadetools.net/forum/...105#post176298
https://www.homemadetools.net/forum/...100#post176282
https://www.homemadetools.net/forum/...980#post179715
https://www.homemadetools.net/forum/...294#post150318
https://www.homemadetools.net/forum/...8302#post87205