122 / | HD | LIQUID HEATERS AND VAPORIZERS |
459 | DF | STEAM TREATMENT {7} |
479.1 | .~ Automatic heat regulation of superheater {6} | |
479.2 | DF | .~.~> Having gas recirculation |
479.3 | DF | .~.~> Having flame positioning |
479.4 | DF | .~.~> With variable firing |
479.5 | DF | .~.~> Having dampers |
479.6 | DF | .~.~> Plural furnaces |
479.7 | DF | .~.~> Once through |