L&N
ELECTRICAL MEASURING INSTRUMENTS-NAMELY, ELECTRIC METERS AND INDICATORS, GALVANOMETERS, VOLTMETERS, AMMETERS, WHEATSTONE BRIDGES, POTENTIOMETERS, [ PERMEAMETERS, ] INDUCTANCE AND CAPACITY BRIDGES, INDUCTOMETERS, ELECTRIC TESTING SETS, ELECTRIC DECADE SETS, RESISTANCE STANDARDS, INDUCTANCE STANDARDS, CAPACITY STANDARDS, STANDARD CELLS, THERMOCOUPLES, ELECTRIC THERMOMETERS, RESISTANCE THERMOMETERS, PHOTOMETERS, PYROMETERS, CONDUCTIVITY CELLS, ION-CONCENTRATION CELLS; INSTRUMENTS FOR MEASURING A...
Expired · February 5, 1929 · 71278903 ·