Keyboards of two different calculators close-up in selective focus
Palabras clave
calculating machine,
desk calculator,
key,
keyboard,
buttons,
rubber,
device,
contraption,
equipment,
display,
digit,
memory,
electronic,
modern,
cheap,
simple,
ordinary,
accurateness,
standard,
portable,
convenient,
calculation,
arithmetic,
mathematic,
worked,
formula,
business,
education,
design,
technology,
isolation
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