In a rostrum, comprising a rostrum support structure comprising a plurality of frame units; the frame units comprising at least a first frame unit, a second frame unit which is retractable in a retraction direction from an extended position into the first frame unit, and a third frame unit, which is retractable in the retraction direction from an extended position into the second frame unit, a latching mechanism is provided which is configured so that the third frame unit cannot be retracted from the extended position into the second frame unit until the second frame unit has been retracted from the extended position into the first frame unit. A respective deck is engaged with each respective frame unit.
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