Lexington, Massachusetts, USA May 2003 Model 979 Series Helium Mass Spectrometer Leak Detector Preface Hazard and Safety Information Some common international symbols used in this manual and the equipment itself are shown below. ° OFF Power Switch Position l ON Power Switch Position Earth Ground Hot...
categories and sub-categories that express most clearly the data as they become available to us. Thus, if genocidal killers choose mentally defective or physically defective people or plain intellectual-looking people with eyeglasses for extermination, categories for this information are formulated and ...