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Old fashioned slide rule isolated on black background.

colorful abacus

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.

Studio shot.

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

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

Vintage logarithm ruler close up isolated on a white background

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

Two hands holding a slide rule or slipstick

colorful abacus

A fragment of a slide rule on a black computer keyboard

female hand on abacus

Close-Up Of Set Square And Protractor Over White Background

Primary school supplies

Colorful wooden abacus for children's learning.

Colorful Chinese abacus

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

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

Abacus children wooden rainbow toy

Plastic instrument for measuring linear dimensions in approximation

Colorful wooden abacus for children's learning.

Old slide rule, mechanical calculator is isolated on white background. Vintage logarithmic ruler

Close Up of Pi on a Slide Rule

Logarithmic ruler on black background. Stationery for engineers and students

Ontario, Canada.

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