FEDERAL

ELECTRONIC AMPLIFIERS, [ ELECTRICAL ALARMS AND ] ELECTRIC SIGNALLING DEVICES FOR USE IN CONNECTION WITH MANUAL, AUTOMATIC, PNEUMATIC, ELECTRIC, AND ELECTRONIC GAGING APPARATUS; DIMENSIONAL COMPARATORS; PROCESS MEASURING AND CONTROL EQUIPMENT; SORTING DEVICES; [ APPARATUS FOR MEASURING PROPORTION, LIQUID FLOW, LIQUID LEVEL, TEMPERATURE, PRESSURE, HARDNESS, TENSILE STRENGTH, DURABILITY, DENSITY AND DISTANCE ]