75670143
Mar 29, 1999
Mar 14, 2000
VACUUM DEPOSITION CONTROLLERS, GAS CONCENTRATION CONTROLLER FOR SENSING, MEASURING AND CONTROLLING THE COMPOSITION OF BINARY GASES; GAS CHROMATOGRAPH; MASS SPECTROMETERS; LEAK DETECTORS FOR SENSING THE PRESENCE OF COMBUSTIBLE GASES AND HALOGEN GASES IN AN ATMOSPHERE; PRESSURE GAUGES FOR USE IN HIGH VACUUM EQUIPMENT
Electrical and Scientific Apparatus