F
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
F
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
F28
HEAT EXCHANGE IN GENERAL
F28
HEAT EXCHANGE IN GENERAL
F28F
DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
F28F
DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
F28F1/00
Tubular elements; Assemblies of tubular elements
F28F1/00
Tubular elements; Assemblies of tubular elements
F28F1/02
Tubular elements of cross-section which is non-circular
F28F1/02
Tubular elements of cross-section which is non-circular