VDO

PHYSICAL, MECHANICAL, OPTICAL, AND ELECTRICAL INSTRUMENTS AND DEVICES FOR INDICATING, MEASURING, REGULATING, AND SUPERVISING THE OPERATION OF AERONAUTICAL VEHICLES-NAMELY, SPEEDOMETERS, INSTRUMENTS FOR MEASURING DISTANCES, DEVICES FOR MEASURING REVOLUTIONS, PRESSURES, OPERATING HOURS, TEMPERATURES, GAGES FOR LIQUIDS, INDICATORS OF CONSUMPTION, OUTPUT AND LOAD, AMMETERS, VOLTMETERS, OHMMETERS, TIME SWITCHES AND TIME-RESPONSIVE IMPULSES, AND CHRONOMETERS