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Computing: Taschenrechner

"Pocket calculator", an old Kraftwerk song & a vintage hi tech tool-50th year anniversary
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Kappa T.
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Old Calculator
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Texas Instruments TI-57 - My very first programmable calculator (1980)
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Sinclair Cambridge Programmable Calculator (around 1975)
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ARISTO M27 (SLIDE RULER PRODUCER)
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Vintage Calculator
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Electronics, Cars, Fashion, Collectibles & More | eBay
Vintage National Semiconductor 4640 Calculator Mathematician Red LED. I still have it, but it doesn't work.
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Casio - Pro fx-1 - - Vintage calculator - Casio Pro fx1 - Casio.ledudu.com - Casio pocket computer, calculator, game and watch library. - RETRO CALCULATOR FX PB SF LC SL HP FA
CASIO Pro fx-1
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HP-41C: My trusty partner for many years!
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Back To The 70s
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First introduced by Hewlett-Packard as a “Personal Computer,” the HP 65 calculator allowed users to either buy programs on pre-programmed cards or write programs up to 100 lines long and record them on blank cards. The device featured user-definable keys and was the first HP pocket calculator with base conversions (octal and decimal). The calculator cost $795 when it launched in 1974. It became the first handheld calculator in space in 1975.