Citizen 820SR

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1975
Description

The Citizen 820SR is a scientific calculator with unknown digits precision and algebraic logic. It has 20 functions, 26 keys and a VFD (vacuum fluorescent) display.

Legacy Content: Unknown Author
Hardware Type
Calculator
Manufacturer
Citizen Holdings Co., Ltd.
Model Number
820SR
Launch Date
1975

Citations:

Courtesy of Calculator.org
Courtesy of Catawiki
Courtesy of MyCalcDB
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