Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 143,372 pages of information and 230,039 images on early companies, their products and the people who designed and built them.
of Grand Buildings, Trafalgar Square, London, WC2. Telephone: Whitehall 3736. Works at Dartford, Kent
1947 British Industries Fair Advert as manufacturers of Precision Measuring and Indicating Instruments including Resistance, Capacitance and Induction Bridges, Moving Coil Meters (A.C. and D.C.), Potentiometers, Radium Detectors, Light Counters, X-ray Dosage Meters, Resistance Boxes, Moisture Meters. (Scientific and Optical Section - Olympia, Ground Floor, Stand No. A.1102) 
1957 Acquired by C. E. Harper Aircraft Co.
Consisted of 2 divisions - electronics and pneumatics
1959 New factory at Dartford
By 1960 was part of Harper Engineering and Electronics
1963 Elliott Automation acquired Baldwin Instrument Co of Dartford, which had 2 areas of operation: nucleonic instrumentation and fluid power equipment, both complementary to Elliott's existing acitivities.
1967 Baldwins and Isotope Developments were combined in one location at Beenham, Berks