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INSTRUMENTS AND APPARATUS FOR THE MEASUREMENT OF TEMPERATURE, DEW-POINT, MOVEMENT AND PRESSURE OF AIR AND OTHER GASES; INSTRUMENTS AND APPARATUS FOR THE MEASUREMENT OF ELECTRICAL RESISTANCE, VOLTAGE AND CURRENT; INSTRUMENTS AND APPARATUS FOR THE MEASUREMENT OF TEMPERATURES OF METALS, FLUIDS AND OTHER MATERIALS; CONTROL APPARATUS FOR INDUSTRIAL PROCESSES USING MEASUREMENTS OF THE QUANTITIES AND CONDITIONS DESCRIBED ABOVE; AND PARTS OF ALL SUCH INSTRUMENTS AND APPARATUS