- ABB Kent - Taylor

- Alexander Wright

- Amrein

- Bristol Babcock

- British Rototherm

- Camille Bauer

- Chessell

- Chino

- Eckardt

- Endress & Hauser

- Foster Cambridge

- Foxboro

- Fuji

- Goerz

- Hartmann & Braun

- Honeywell

- ITT Barton

- Jules Richard Instruments

- Jumo/Jucheim

- Kent

- Leeds and Northrup

- Meci

- Metrawatt

- Negretti & Zambia

- Philips

- Record Electrical

- Siemens

- Taylor

- Toshiba