The Model 400A in the 1948 Catalog

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The HP Model 400A Vacuum Tube Voltmeter

 

 

The HP 400A in the HP Memory Project Collection
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The Model 400A in the 1948 Catalog

 

Page 26 of the 1948 Catalog
Courtesy of the Hewlett Packard Company
Page 27 of the 1948 Catalog
Courtesy of the Hewlett Packard Company

 

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