Actually a mechanism may extend beyond the FRAME PERIMETER up to the BUMPER PERIMETER. (The BUMPER ZONE is a volume between two horizontal planes; it is impossible to extend horizontally beyond the limits of this infinite volume.)
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Originally Posted by <R30>
a. BALL Interaction Volume – Solely for the purposes of interacting with a BALL, MECHANISMS that are below the BUMPER ZONE may extend up to the BUMPER PERIMETER, for a period not exceeding two seconds. After returning inside the FRAMER PERIMETER, such MECHANISMS are not permitted to re-extend beyond the FRAME PERIMETER for at least two seconds.
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