73032023
Sep 16, 1974
Mar 9, 1976
VAPOR DETECTION AND VAPOR EXHAUST CONTROL APPARATUS FOR SOLVENT VAPOR DEGREASING APPARATUS CONSISTING OF SENSING UNITS FOR DETECTING AND MONITORING SOLVENT VAPOR CONCENTRATIONS AND A CONTROL UNIT FOR ACTIVATING A FAN FOR EXHAUSTING SUCH VAPORS WHEN THE VAPOR CONCENTRATION EXCEEDS A PREDETERMINED LEVEL
Environmental Control Apparatus