73159206
Feb 21, 1978
Apr 8, 1980
ELECTRIC HEATING ELEMENTS-NAMELY, IMMERSION HEATERS AND CIRCULATION HEATERS FOR LIQUIDS SUCH AS WATER, OIL, WAX AND CHEMICAL SOLUTIONS, TUBULAR DUCT HEATERS FOR APPLICATION TO PLATENS, MOLDS, DIES, PIPE LINES AND THE LIKE
Environmental Control Apparatus