IPC Subgroup
F28F 1/04 polygonal, e.g. rectangular
Introduced: September 1968
Last revised: January 2006
Full Title
Tubular elements; Assemblies of tubular elements > Tubular elements of cross-section which is non-circular > polygonal, e.g. rectangular
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