Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 162,258 pages of information and 244,500 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.
of London
1939 Became private company.
1959 Made public company.
1961 Manufacturers and suppliers of hearing aids, audiometers and electric stethoscopes, specialists in accessories for use in detecting flaws and faults in industrial machinery and instruments used in transistor circuits and control units for automation.
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