of rubber; of plastics material; of varnish

Full Title

Preventing the formation of deposits or corrosion, e.g. by using filters > by using coatings, e.g. vitreous or enamel coatings > of rubber; of plastics material; of varnish

Classification Context

Section:

MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING

Class:

HEAT EXCHANGE IN GENERAL

Subclass:

DETAILS OF HEAT-EXCHANGE OR HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION