Old Soviet-made pocket slide rule mechanical calculator.
Schlüsselwörter
logarithm,
tool,
vintage,
rule,
retro,
calculating machine,
calculate,
antique,
calculating,
computer,
computing,
equipment,
instrument,
mathematical,
mathematic,
number,
old,
ruler,
scale,
school,
science,
slide,
technical,
white,
work
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