IBM computers at CERN, 1968
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IBM at 100: From typewriters to the cloud

Say IBM - and you probably still think of computers.

But today, the firm that was once all about hardware, makes its living from more intangible technology.

As it celebrates its centenary, International Business Machines is a business that shows how innovation has accelerated - and how fast you have to move to stay ahead.

The BBC's technology correspondent Rory Cellan-Jones reports.

Special report: The Technology of Business

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