Abstract: A method of manufacturing structural sheet metal products whereby a number of portions of sheet metal are fed simultaneously along concurrent planes so that the leading edge of one portion cooperates with a face of an adjacent portion along the plane of contact between the two portions; respective sheets are cut simultaneously off the portions; and the sheets are welded together along the respective planes of contact; cutting and welding being performed using laser heads.

Abstract: A process and apparatus for manufacturing structural steel metal products in which a strip of sheet metal is fed along a plane and cut by a laser into a number of sheets with each sheet secured to a respective supporting surface of a rotary work holder and welded by an additional laser to the previous sheet along a common edge.

Abstract: The apparatus for the non-intrusive fragmentation of renal calculi, gallstones or the like according to the invention comprises at least one ultrasonic receiver-transmitter head (12) focused on the renal calculus (11), gallstone or the like to be disintegrated, a head (12) being associated with a low-power variable frequency transmitter (16) and with a receiver (18) to perform a spectral analysis of the characteristic resonance frequencies of the renal calculus (11), gallstone or the like to be disintegrated, and a controller (Tx1, OSC1) to cause a transmitter (16) to emit relatively high-power energy peaks at the characteristic resonance frequencies of the renal calculus (11), gallstone or the like to promote its disintegration.