1960 - Inventions - Portable Calculator

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1.
advancement
2.
arithmetic
3.
battery
4.
calculator
5.
compact
6.
computation
7.
development
8.
device
9.
digits
10.
display
11.
efficiency
12.
electronic
13.
handheld
14.
mathematics
15.
numeric
16.
operational
17.
portable
18.
precision
19.
revolution
20.
science