Instrument Makers
- AEI (now Kratos)
- DuPont (obsolete)
- GammaData
- Hewlett-Packard (obsolete)
- JEOL
- Kratos (merged into Shimadzu)
- Leybold
- Omicron (merged with Scienta)
- PHI (merged into Ulvac)
- Riber (obsolete)
- Rigaku
- Scienta
- Scienta-Omicron
- Shimadzu-Kratos
- Specs
- Staib
- Surface Science Instruments (merged into Thermo)
- Thermo Scientific
- Ulvac-PHI
- VG Scientific (merged into Thermo)
- VSW (obsolete)