Grace's Guide To British Industrial History

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Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 167,775 pages of information and 247,161 images on early companies, their products and the people who designed and built them.

Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 147,919 pages of information and 233,587 images on early companies, their products and the people who designed and built them.

Sigma Instrument Co

From Graces Guide
Revision as of 12:37, 21 February 2008 by Anita (talk | contribs) (New page: of spring Road, Letchworth, Hertfordshire. Telephone: Letchworth 446. Telegraphic Address: "Sigma, Letchworth". * 1937 Listed Exhibitor. Gas Calorimeters. Gas and Air Flow Meters. S...)
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of spring Road, Letchworth, Hertfordshire. Telephone: Letchworth 446. Telegraphic Address: "Sigma, Letchworth".

  • 1937 Listed Exhibitor. Gas Calorimeters. Gas and Air Flow Meters. Steam Flow Meters. Pressure Recorders. Automatic Gas Mixing. Relay Operated Exhauster Regulators and Retort House Governors. CO2 Recorders. Distant Recorders and Distant Indicators. (Stand Nos. Ca. 813 and Ca.712)


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