Ranco to Trion
List of manufactureres
Ranco Rheem Robertshaw Ruud Samsung Sanyo Sears Siemens Singer Space Pak Spirotherm Taco Tappan Teledyne-Laars Tempstar Trane Trion
Unico Utica Watts Regulator Weatherking Weil-Mclane Westinghouse Whirlpool White Rodgers Williams York