VA

MEASURING AND SCIENTIFIC APPLIANCES-NAMELY, PARTICLE ACCELERATORS, [ ELECTRON DIFFRACTION ] AND X-RAY EQUIPMENT; GAS CHROMATOGRAPHS, [ INTERFEROMETERS, MAGNETOMETERS, ] SPECTROMETERS, [ SPECTROPOLARIMETERS, ] SPECTROPHOTOMETERS, [ GRADIOMETERS ] AND FLUXMETERS; [ CALORIMETERS, ] ELECTROMETERS, [ ELECTRON MICROSCOPES, SEISMOGRAPH AND TILTMETER GEOPHYSICAL INSTRUMENTS; ] VACUUM DISCHARGE AND IONIZATION GAUGES; AND DIGITAL INDICATORS, PLOTTERS, AND GRAPHIC RECORDERS