The companies which exhibited for thirty years are listed below. The first annual equipment exhibit was held in 1965 but exhibits were also held in 1961 and 1963. Several of the companied have either changed name or ownership; in these cases, the original thirty year member and the current company name are listed.
Ceramaseal- Ceramtec North America
CHA Industries
Denton Vacuum- Denton Vacuum LLC
Edwards High Vacuum- BOC Edwards
Ferrofuidics- Ferrotec USA Corporation
Granville Phillips Co.- Helix Technology Corp
Huntington Mechanical Labs
Leybold Vacuum Technologies
R.D. Mathis Co.
MKS Instruments Inc
Physical Electronics
Quad Group Inc.
Stokes- Stokes/BOC Edwards
Teledyne Hastings-Raydist/Brown Engineering- Teledyne Hastings Instr.
ULVAC Technologies Inc.
Vacuum Research Manufacturing- Vacuum Research Corp
Varian- Varian Vacuum Technologies
VAT Inc
Veeco-Digital Instruments Veeco Instruments Ion Tech