It was over 1000 times faster than the mechanical calculators available at the time.

He advocated mechanical calculators and had one in his office.

He is best known for his invention of Japan's first mechanical calculator.

Its production release in 1851 marks the beginning of the mechanical calculator industry.

Electric motors were used on some mechanical calculators from 1901.

Schickard's work had no impact on the development of mechanical calculators.

Odhner developed the first version of his mechanical calculator in 1873.

At home, he had a large personal collection of mechanical calculators, slide rules, etc.

All the calculations had to be done manually at first, on big mechanical calculators.

In 1773 he designed the first functional mechanical calculator.

This was a mechanical calculator with three internal functions.

After three years of effort and fifty prototypes, he invented the mechanical calculator.

Mechanical calculators, used before electronic computers were developed around World War 2.

Contrary to Grillet's claim, it was not a mechanical calculator after all.

With the aid of mechanical calculators, the values were transferred directly to the gun towers.

The necessary calculation was first carried out manually and later by mechanical calculators.

Its user interface was used throughout during the 120 years that the mechanical calculator industry lasted.

His Difference engine is the first mechanical calculator.

The first half of the 20th century saw the gradual development of the mechanical calculator mechanism.

The mechanical calculator was at the root of the development of computers in two separate ways.

They were also found in motor-driven mechanical calculators; the Marchant had several of them.

Over time, during the 1950s and 1960s a variety of different brands of mechanical calculators appeared on the market.

In the 1930s the company manufactured mechanical calculators.

Pascal is recognized for inventing the first practical mechanical calculator.

He used a small mechanical calculator to solve each problem, a laborious process later rapidly accomplished by computer.