Grace's Guide

British Industrial History

Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 148,406 pages of information and 233,863 images on early companies, their products and the people who designed and built them.

High Vacuum Valve Co

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1935. Hivac.
1935. Hivac.

of Farringdon Road, London

Previously Freedman Valve Co

1930-33 Paul Freedman was MD

Name changed to Hivac.

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