Page last updated at 13:31 GMT, Friday, 11 April 2008 14:31 UK

In pictures: Silicon Valley's birthplace

367 Addison Avenue, BBC

367 Addison Avenue is now California historical landmark No. 976

Iron gate, BBC

Visitors are kept away from the historic garage by an iron gate

Inside the garage, BBC

Five years of work has restored the garage to its 1940s glory

Photo on bench in garage, BBC

Memorabilia on display shows Bill and Dave at work in the 1940s

Garden shed, BBC

Bill Hewlett lived in this humble garden shed for years

Inside the garden shed, BBC

There were few home comforts inside the wooden shack

Living room at Addison Avenue, BBC

One of HP's first oscillators is on display in the living room

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