71474007
Sep 8, 1944
Aug 7, 1945
LIQUID FUEL COMBUSTION HEATERS-NAMELY SP ACE HEATERS FOR HEATING ROOMS, GARAGES, CABINS, AIRCRAFT CABINS, HOSPITAL AND FIELD TENTS, AND THE LIKE, AND HEATERS FOR LOCALIZED HEATING FOR WARMING ENGINES, MILK PAILS, OIL SUMPS, RUNNING AND RETRACTABLE AIRCRAFT MECHANISMS AND THE LIKE, AND FOR PREHEATING VATS CONTAINING MATERIAL OF HIGH VISCOSITY AND THE LIKE
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