Pencil, old slide rule and scientific electronic calculator page with the calculations in progress
Schlüsselwörter
mathematic,
rule,
crayons,
slide,
old,
scientific,
electronic,
number,
white,
engineering,
ruler,
isolated,
logarithm,
scale,
tool,
antique,
background,
calculating machine,
retro,
engineer,
mathematic,
school,
science,
mathematical,
calculate,
calculation,
education,
instrument,
vintage,
closeup,
multiplication,
obsolete,
calculating machine,
logarithmic,
analog,
closeup,
computing,
measure
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