made of ceramic; made of concrete; made of natural stone

Full Title

Details of absorbing elements > characterised by the absorbing material > made of ceramic; made of concrete; made of natural stone

Classification Context

Section:

MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING

Class:

HEATING; RANGES; VENTILATING

Subclass:

SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS