26 RECORDING DEVICES-NAMELY, INDUSTRIAL, LABORATORY AND CHEMICAL THERMOMETERS; MERCURY ACTUATED RECORDING THERMOMETERS; MERCURY ACTUATED, REMOTE READING, DIAL THERMOMETERS; MERCURY ACTUATED RIGID STEM DIAL THERMOMETERS; LIQUID FILLED DIAL THERMOMETERS; PRESSURE, VOLUME, TIME AND TEMPERATURE INSTRUMENTS; PRESSURE-VOLUME RECORDERS; BATTERY OPERATED CHART DRIVES; PRESSURE-VOLUME-TEMPERATURE RECORDERS