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Old fashioned slide rule isolated on black background.

Slide Rule on a mechanical drawing of a gear box.

Two hands holding a slide rule or slipstick

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

Studio shot.

slide rule on a green background

Close Up of Pi on a Slide Rule

Slide rule, close up

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.

Slide rule math instrument set to the value pi

retro school or business object: calculating with a slide rule, multiplications written on paper

slide rules made of wood and plastic

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

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

A Vintagle mechanical analog computer. The slide rule is used primarily for multiplication and division It is also used for functions such as exponents, roots, logarithms and trigonometry

Close-Up Of Set Square And Protractor Over White Background

colorful abacus

Two beautifully crafted wooden abacuses featuring colorful and vibrant beads designed to effectively teach math concepts

$A fragment of a slide rule on a black computer keyboard$

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

close up on colorful abacus for kids early education

Colorful Chinese abacus

Vintage slide rule displaying cyrillic text for flight navigation on white background

close up of a used filing cabinet with numbered slots for small horizontal objects, for sale at a salvage yard, Long Island, New York

An old punch card on a dark background, old technology, 20th-century technology, early computer data.

Primary school supplies

Part of old computing slide ruler closeup isolated over white

Mathematical formulas. Photography made with colored filters in the flash

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