… for working any material by removal of material, by laser or other light or photon beam, ultrasonic, … electro-chemical, electron beam, ionic-beam or plasma arc processes; water-jet cutting machines. …
Explanatory notes
… for working any material by removal of material, by laser or other light or photon beam, ultrasonic, … electro‑chemical, electron beam, ionic‑beam or plasma arc processes; water-jet cutting machines . …