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<1980 Number Data-Base
Random Number
1982>

The Number 1981: Properties and Meanings

Prime Factors of 1981=7x283.


The Year 1981 AD

In the year 1981 AD MS-DOS was invented.

In the year 1981 AD The first IBM-PC was invented.

In the year 1981 AD the scanning tunneling microscope was invented by Gerd Karl Binnig and Heinrich Rohrer.

<1980 Number Data-Base
Random Number
1982>
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