Environmental control apparatus Trademarks Filed in February 12, 1952
ALCO
Filed: February 12, 1952
CARTRIDGE-TYPE FILTERS FOR GENERAL USE
Owned by: AMERICAN LOCOMOTIVE COMPANY
Serial Number: 71624807
UNITROL
Filed: February 12, 1952
COMBINED PILOT AND MAIN BURNER GAS VALVES WITH BUILT-IN-FILTER
Owned by: ROBERTSHAW CONTROLS COMPANY
Serial Number: 71624851
