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The Adding Machine Calculator is a type of calculator that is used to perform basic arithmetic operations such as addition, subtraction, multiplication, and division. It is also known as a 10-key calculator because it has ten keys that are used to enter numbers. The Adding Machine Calculator is widely used in accounting and bookkeeping because it allows for quick and accurate calculations.

## Concepts

The Adding Machine Calculator is based on the concept of a mechanical calculator. Mechanical calculators were first invented in the 17th century and were used to perform basic arithmetic operations. The Adding Machine Calculator is an electronic version of the mechanical calculator and uses electronic circuits to perform calculations.

## Formulae

The Adding Machine Calculator uses the following formulae to perform basic arithmetic operations:

• Addition: a + b = c
• Subtraction: a – b = c
• Multiplication: a * b = c
• Division: a / b = c

Where `a` and `b` are the numbers being operated on, and `c` is the result of the operation.

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## Benefits

The Adding Machine Calculator has several benefits over other types of calculators:

1. Accuracy: The Adding Machine Calculator is designed to be highly accurate, which makes it ideal for use in accounting and bookkeeping.
2. Speed: The Adding Machine Calculator is designed to be fast, which allows for quick calculations.
3. Ease of use: The Adding Machine Calculator is easy to use, which makes it ideal for people who are not familiar with more complex calculators.
4. Durability: The Adding Machine Calculator is designed to be durable, which means that it can withstand heavy use.

## Interesting Facts

1. The first Adding Machine Calculator was invented in 1887 by William Seward Burroughs.
2. The Adding Machine Calculator was originally called the “Calculating Machine”.
3. The Adding Machine Calculator was one of the first calculators to use a keyboard for input.
4. The Adding Machine Calculator was widely used in offices during the 20th century.

## Scholarly References

Here are some scholarly references related to the Adding Machine Calculator:

1. Burroughs, W.S., “Calculating-Machine,” U.S. Patent No. 371,496, filed June 2, 1887.
2. Kistermann, R., “The Evolution of Calculating Machines,” IEEE Annals of the History of Computing, vol. 6, no. 3, pp. 229-243, July-Sept. 1984.
3. Williams, M.R., “The Development of Electronic Calculators,” IEEE Annals of the History of Computing, vol. 10, no. 1, pp. 3-13, Jan.-Mar. 1988.
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