392 / | HD | ELECTRIC RESISTANCE HEATING DEVICES |
* | DD | HEATING DEVICES (CLASS 219 SUBCLASS 200) {11} |
465 | DF | .~ Continuous flow type fluid heater {12} |
473 | DF | .~.~ Fluid heater carried on discharge member {2} |
474 | ![]() | .~.~.~ With flow control valve (e.g., faucet, etc.) {1} |
475 | DF | .~.~.~.~> Valve turns heating element on and off |