Flexible tubing formed of a wire helix wrapped helically with plastic tape having overlapping turns fused directly together ultrasonically, with no extraneous adhesive, and with knurling imprinted on the tubing interior, and apparatus and a method for making such tubing wherein a rotating cantilevered...http://www.google.es/patents/US4427485?utm_source=gb-gplus-sharePatente US4427485 - Ultrasonically bonded helically fabricated tubing and apparatus and method for making same
Ultrasonically bonded helically fabricated tubing and apparatus and method ...
