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Old fashioned slide rule isolated on black background.

colorful abacus

Compilation of several slide rules, analog calculators, and measurement devices

Studio shot.

Vintage slide rule on a white background, showcasing its precision scales and cursor. A classic mathematical tool for calculations, often used in engineering and science before electronic calculators.

Close up detail of a log/log slide rule isolated on a black background.

Vintage logarithm ruler close up isolated on a white background

Macro image of old scratched slide rule - an old mathematical tool for calculations from before the era of electronic calculators.

Slide rule, close up

colorful abacus

Close-Up Of Protractor Over White Background

Close-up of abacus toy and little girl lying in the background

A fragment of a slide rule on a black computer keyboard

Primary school supplies

Colorful wooden abacus for children's learning.

Ontario, Canada.

Slide Rule on a mechanical drawing of a gear box.

close up on colorful abacus for kids early education

Part of old computing slide ruler closeup isolated over white

Mathematical formulas. Photography made with colored filters in the flash

Logarithmic ruler on white background. Stationery for engineers and students

Plastic instrument for measuring linear dimensions in approximation

Abacus children wooden rainbow toy

group of old slide rule slipstick analogue computer for mathematical calcululs, close view

female hand on abacus

Two hands holding a slide rule or slipstick

Colorful Chinese abacus

slide rule on a green background

Colorful wooden abacus for children's learning.

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