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 148,369 pages of information and 233,846 images on early companies, their products and the people who designed and built them.

Sound Sales

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September 1933.
December 1936.
December 1945
September 1947
August 1948. Rho-metal scratch choke.
January 1949.
March 1949.
September 1949.
December 1951. Amplifier Type A-Z.
June 1955. Phase Inverter Speaker.

of 57 St. Martins Lane, London WC.2.

Established 1930.

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Sources of Information