8" Circular Binary Trig Slide Rule Copyrights 1931/1940
$25.00 USDSold on: 2013-Aug-05
Marketplace: eBay
Detail:
8” Circular Binary Trig Slide Rule Copyrights 1931 / 1940 · I guess the © 1931 slide rule was eventually mated with the © 1940 slide rule to get this one. · Printed area has 8” diameter. Full ...
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