CPC Subgroup
B21D 15/03 by applying fluid pressure
Full Title
Corrugating tubes (wrinkle-bending using mandrels or the like B21D9/14) > longitudinally > by applying fluid pressure
B21D 15/03 Corrugating tubes (wrinkle-bending using mandrels or the like B21D9/14) > longitudinally > by applying fluid pressure