| http://www.w3.org/ns/prov#value | - The essential point is that the means are designed in such a way that no light can arrive at the filling compound as long as this is not desired by the user, or that only so little light strikes the filling compound that it does not lead to a premature, undesired hardening reaction.In another exemplary embodiment, the safety means comprise a device, in particular a switching device, which is desig
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