Classification Information
REFERENCE MATERIALS IN THE NATURE OF PELLETS, DRILLINGS, DISKS, PINS, CHIPS, LIQUIDS, AND POWDERS FOR CALIBRATING SCIENTIFIC AND LABORATORY APPARATUS, NAMELY, ANALYZERS FOR ANALYTICAL SPECIMEN SAMPLES TO FACILITATE CALIBRATION AND QUALITY CONTROL OF INSTRUMENTS AND FOR THE DETERMINATION OF CHEMICAL ANALYSIS FOR ELEMENTAL AND MOLECULAR AND COMPLEX CHEMISTRIES IN GENERAL
Electrical and Scientific Apparatus