| http://www.w3.org/ns/prov#value | - A television camera comprising a camera housing, a pick-up tube mounted in said housing, a rotatable turret mounted at the front of said housing, a plurality of lens units each including a lens mounted on said turret, means for indexing the turret in a plurality of positions in which the different lenses are selectively positioned in an operative position in front of the pick-up tube, a reversible
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