using evacuated elements

Full Title

Details, accessories or component parts of solar heat collectors not provided for in groups > Transparent coverings; Elements for transmitting incoming solar rays and preventing outgoing heat radiation > using evacuated elements

Classification Context

Section:

MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING

Class:

HEATING; RANGES; VENTILATING

Subclass:

SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS