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Detail of the outer surface of the closure.

Picture 9 of 11.

Detail of one of the reinforcing doublers around the periphery of the closure. Note the bolt hole between each doubler.

Most of the doublers are labelled "009" as this one is, although doublers on either side of each of the closure's fold lines are labelled differently: The doubler clockwise of the fold line is labelled "007" while the one counter-clockwise is labelled "005".