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Casio CFX-40 Scientific Calculator Watch | Vintage Electronics Have Soul – The Pocket Calculator Show Website
Casio CFX-400 | Liquid Crystal
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CASIO CFX-40 Japan M - Violity
Two errors in manual from 1985 of Casio CFX-40/400 | WatchUSeek Watch Forums
MECATRÓNICA - Casio CFX-200 from 1983 ⌚⌚ | Facebook