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1. An apparatus comprising a drum that rotates in a direction-of-rotation about an axis thereof, said drum being a vacuum drum, a holder pair that rotates with the drum, said holder pair comprising vacuum holders that are disposed at a peripheral surface of said drum and that are offset relative to each other along said drum's direction of rotation, wherein said vacuum holders comprise a leading holder that holds a leading edge of a label for labeling a container and a trailing holder that holds a trailing edge of said label, rotating switches that transition between operating positions, switch actuators that cause said rotating switches to transition between said operating positions, and switch controllers that engage said switch actuators to initiate transitions between said operating positions, thereby causing said holders to transition between a rest position, in which said holders are held at a position that avoids application of glue on said label, and a working position, in which said holders are held so as to promote application of glue on said label held by said pair, said switch controllers being stationary, and wherein said rotating switches each comprise a U-shaped carrier having side limbs connected by a base limb, an axle that rotates about an axis that is parallel to said drum's axis, and rocker levers disposed along said axle.
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