Handbook of Designs and Devices (Dover Pictorial Archive)
ISBN: 0486201252
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Found in 1 comment on Hacker News
polm23 · 2016-06-07 · Original thread
Find this and other symbols in Hornung's Handbook of Designs and Devices, first published in 1932.

https://en.wikipedia.org/wiki/Clarence_P._Hornung

http://www.amazon.co.jp/Handbook-Designs-Devices-Pictorial-A...

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