Wow, you're right, 525.2 didn't exist until 2008. In all its glory from NEC 2008:
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525.2 Definitions.
Operator. The individual responsible for starting, stopping, and controlling an amusement ride or supervising a concession.
Portable Structures. Units designed to be moved including, but not limited to, amusement rides, attractions, concessions, tents, trailers, trucks, and similar units.
