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Archive image from page 105 of Development of a spherical acrylic. Development of a spherical acrylic plastic pressure hull for hydrospace application . developmentofsph00stac Year: 1970 Figure 67. Split hatch retaining ring for top and bottom polar closures of the 66-inch-diameter capsule: view from the interior of the capsule.
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Photo credit: © Actep Burstov / Alamy / Afripics
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