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Mechanical counter

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

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

Metal gears and cogs mechanism with numbers

Instrument of Measurement

Circles with many various numbers, abstract numerological background

Mental arithmetic Japanese abacus called soroban placed on printed practice calculations.

Ruler

old slide rule slipstick analogue computer for mathematical calcululs, top view

IRS Income tax form 1955 tax table

Closeup of Antique calculater, slide rule, over white background.

Measuring tape

An old music-roll, used to play a piano or organ automaticly

Representing the passage of time, close-up of a sundial in the Cuban municipality of Rafael Freyre which is situated in Holguin Province.

$three slide rules of different sizes on a white background.\nThree slide rules of different sizes on a white background$

Old page with multiplication table.

A soroban is an abacus that is used for performing arithmetic calculations. It consists of a rectangular frame with rods or wires on which beads are strung. The beads are used to represent digits and are moved up or down to perform mathematical operations. The soroban is still widely used in Japan and other parts of Asia as a tool for mental calculation, and is also taught in schools as a method of learning arithmetic.

Add-lister receipts and calculator.

A unique image arranged with clocks and numbers. There are also time-travel images.

Close-up of a tape measure and a calculator in gray tones. Shallow depth of field.

Logarithmic ruler isolated on white background. Stationery for engineers and students

Shallow DOF, focus is on the center ring

selective focus, calculator or calculating machine on a white background, a tool for calculating from simple calculations

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

Traditional handmade Colorful toys made from wood, wooden toys, family, selective focus.

Vintage Typerwriter Keys. On pure White Background. Clean of dust and dirt. Scratched corroded and worn to give real character.

A photo of a mathematics protractor on top of a black calculator on a white desk.

High resolution metal protractor isolated with clipping path

still life of drawing and type design tools on tabletop

Wooden folding ruler.

Free Images: "bestof:...Lucas rulers full 600.png en set of Genaille-Lucas rulers own Worrydream 2010-01-30 Mechanical calculators Multiplication"

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