bent spirally

Full Title

Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically > built-up from water tubes of form other than straight or substantially straight > bent spirally

Classification Context

Section:

MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING

Class:

STEAM GENERATION

Subclass:

METHODS OF STEAM GENERATION; STEAM BOILERS