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2. Casio - Wikipedia

   en.wikipedia.org/wiki/Casio

   Casio. Casio Computer Co., Ltd.[ note 1] (カシオ計算機株式会社, Kashio Keisanki Kabushiki-gaisha) is a Japanese multinational electronics manufacturing corporation headquartered in Shibuya, Tokyo, Japan. Its products include calculators, mobile phones, digital cameras, electronic musical instruments, and analogue and digital watches.

3. Mechanical calculator - Wikipedia

   en.wikipedia.org/wiki/Mechanical_calculator

   The cash register, invented by the American saloonkeeper James Ritty in 1879, addressed the old problems of disorganization and dishonesty in business transactions. [74] It was a pure adding machine coupled with a printer , a bell and a two-sided display that showed the paying party and the store owner, if he wanted to, the amount of money ...

4. Calculator - Wikipedia

   en.wikipedia.org/wiki/Calculator

   The arrangement of digits on calculator and other numeric keypads with the 7-8-9 keys two rows above the 1-2-3 keys is derived from calculators and cash registers. It is notably different from the layout of telephone Touch-Tone keypads which have the 1 - 2 - 3 keys on top and 7 - 8 - 9 keys on the third row.

5. Casio FX-502P series - Wikipedia

   en.wikipedia.org/wiki/Casio_FX-502P_series

   141 g, 5 oz. Dimensions. 15.24×7.6×1.2 cm, 6"×3"×½". The FX-501P and FX-502P were programmable calculators, manufactured by Casio from 1978/1979. [citation needed] They were the predecessors of the FX-601P and FX-602P . It is likely that the FX-501P/502P were the first LCD programmable calculators to be produced as up until 1979 (and the ...

6. Casio FX-602P series - Wikipedia

   en.wikipedia.org/wiki/Casio_FX-602P_series

   The FA-2 Interface was used the FX-602P series of programmable calculator and the FX-702P Pocket Computer to store programs and data register to Compact Cassette. When compared with its predecessor the Casio FA-1 the FA-2 featured an additional tape control output and connector for the Casio FP-10 printer.

7. Casio FX-603P - Wikipedia

   en.wikipedia.org/wiki/Casio_FX-603P

   2×"CR-2032" Lithium + 1×"CR-2032" Lithium. Weight. 141g, 5 oz. Dimensions. 15.24x7,6x1.2 cm, 6"×3"×½". The FX-603P was a programmable calculator, manufactured by Casio from 1990. It was the successor model to the Casio FX-602P. Since it was only released in a limited number of countries in small quantities, it is now an excessively rare ...