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bizfluent.com/about-4696172-adding-machine-functions.html

The equal sign on a adding machine functions only when calculating multiplication or division functions. When totaling numbers with addition and subtraction, the diamond and asterisk keys provide answers. The diamond key prints a subtotal of the numbers tabulated to that point.

www.tenkeycalculators.com/addandsubtract.html

Equals (=) Is Not the Way to Go. Use the total key (* or T) to sum your numbers. The easiest way to think of a ten-key calculator is as an adding machine (many of which print this nice little tape for you as proof that you did indeed add that staggering column of numbers correctly). Its sole function is to add numbers.

bizfluent.com/how-4761685-adding-machine-instructions.html

An adding machine is also called a 10-key or a printing calculator. They no longer teach students how to use these machines, but they still use them in companies. Adding machines have a lot of symbols and buttons. Some are foreign and strange to anyone who has never used an adding machine, but it isn't very ...

www.wisegeek.com/what-is-a-ten-key.htm

While learning the basics of ten key may take only a few minutes, it can take months of practice to master. Types of Machines. The original ten key was an adding machine; the three by three arrangement of keys was first used in 1911 on a machine invented by David Sundstrand of the Sundstrand Adding Machine Company.

www.theclassroom.com/use-functions-adding-calculator-24107.html

A 10-key adding machine tutorial can be found online for those who want to make their work on the machine more efficient. Follow the printing calculator instructions if you have any questions or get stuck on a function. The adding machines with a bevy of buttons need a bit more understanding than their 10-key counterparts and are a lot more ...

www.staples.com/10+key+adding+machine/directory_10+key+adding+machine

10+key+adding+machine. Staples Sites Print ... Add to cart Victor® 1212-3A Commercial 12-Digit Printing Calculator, With Built-In Anti-Microbial Protection. $82.99. 1Each. Item # 813637. Model # 1212-3A. Canon MP27DII 8707B001AA 12-Digit Desktop Printing Calculator, Gray.

sciencing.com/difference-between-adding-machine-calculator-6577047.html

The adding machine was, in many ways, a predecessor to the calculator. The earliest versions of the mechanical adding machine became available for purchase in the late 19th century, with the ten-key model (one key for each number) becoming a standard fixture by the mid 20th century.

deskcalc.com

DeskCalc is a feature rich "paper tape calculator" with all of the functions you expect from a mechanical adding machine plus capabilities associated with a Windows environment. Calculator modes all in one..

www.reference.com/math/keys-calculator-mean-a61ad3b813fe34d9

What Do the Keys on a Calculator Mean? There are many kinds of calculators, but most calculators have the same standard keys that allow users to complete a variety of calculations. The number keys and addition, subtraction, multiplication, division and equal signs are all very straightforward, but the functions of the other keys are not so well ...

www.reference.com/math/10-key-adding-machine-27e654245dbb795e

A 10-key adding machine is a mechanical calculator used in companies and stores before there were electronic calculators. This machine can perform simple calculations, such as addition and subtraction of numbers. The earliest adding machine dates back to the 1800s.