Site.KL11960s History
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08 December 2011
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http://meta-studies.net/pmwiki/uploads/RussianCircular.jpg
1960s: KL-1 Russian Mechanical Circular Slide Rule and case.
Slide Rule Watch - Model KL-1’s Texnichesko-Cbetovaya Organizatsia “Rassvyet” Technical and Lights Company “Sunrise”