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Herman Hollerith founded the Tabulating Machine Company in 1896.
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The company was renamed to this in 1924
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IBM and Howard University jointly developed the Mark I.
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Robert H Dennard invented the DRAM memory chip, which was a core development in the launch of today's computer industry.
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IBM made and sold massive computers to large governments and corporations before computers were devices for regular people. IBM employed 100,000 people.
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It was one of the first computers intended for home consumer use. It cost $1,565.
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IBM hired Microsoft to write an operating system for its PC, which was called MS-DOS.
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The company celebrated passing Microsoft's market value for the first time in 15 years.