| http://www.w3.org/ns/prov#value | - In the case of the present invention, the expression ???optical means of the multifocus type??? is understood to mean that the optical means, for example a lens, makes it possible to focus the laser beam at several focusing points separated from one another, usually a first and a second separate focusing point, which points generally lie on an axis approximately coaxial with the axis of the nozzle
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