SPEEDOMAX
AUTOMATIC ELECTRICAL MEASURING INSTRUMENTS, AUTOMATIC ELECTRICAL RECORDERS AND CONTROLLERS, AND COMBINED AUTOMATIC ELECTRICAL RECORDERS AND CONTROLLERS, FOR MEASURING, RECORDING, AND CONTROLLING VARIATIONS IN MAGNITUDE OF PHYSICAL, CHEMICAL, MECHANICAL AND ELECTRICAL CONDITIONS AND FORCES, SUCH AS TEMPERATURE, ELECTROMOTIVE FORCE, IMPEDANCE, CURRENT, AND THE LIKE
Expired · April 1, 1935 · 71363287 ·