US1828501A
|
|
Thermostatic control valve
|
US1839229A
|
|
Thermostatic valve
|
US1749385A
|
|
Gas burner
|
US1744124A
|
|
Hot-water heater
|
US1708508A
|
|
Thermostatic valve mechanism
|
US1262431A
|
|
Burner.
|
US1261470A
|
|
Induction water-heater.
|
US1246523A
|
|
Water-heater.
|
US1246522A
|
|
Burner.
|
US1246521A
|
|
Water-heater construction.
|
US1317951A
|
|
Thermostatic controlling mechanism for water-heaters.
|
US1263730A
|
|
Instantaneous water-heater.
|
US1217133A
|
|
Water-heater.
|
US1166424A
|
|
Water-heater.
|
US1027832A
|
|
Burner.
|
US1053906A
|
|
Instantaneous water-heater.
|
US993723A
|
|
Instantaneous water-heater.
|
US1133016A
|
|
Instantaneous water-heater.
|
US961434A
|
|
Heater.
|
US908236A
|
|
Burner.
|