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wrote...
Posts: 173
A week ago
These are vestibules that have two interlocking doors on each side, where one door must be closed before the other can open:

▸ Mantraps

▸ Alleyways

▸ Safe hallways

▸ Citadels
Textbook 
Introduction to Security: Operations and Management
Edition: 5th
Authors:
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Posts: 227
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Mantraps
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