B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
B21D3/10—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts between rams and anvils or abutments
Process for stabilising, in a steady state, the separation front between an upper vapour region and a lower vapour region which are created in an apparatus comprising a vessel, apparatus making use of the said process and use of the said apparatus
Procédé de démoulage de tubes ou de barreaux de glace obtenus dans un congélateur tubulaire à détente directe et installation pour la mise en oeuvre de ce procédé
Moteur hydraulique ou pompe verticale a commande par courroie sans fin fonctionnant par accumulation d'une masse liquide puis son transfert gravitaire d'un niveau superieur a l'aplomb d'un autre vertical