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Alternatively, the doors (604) may be part of a security door system used in banks and other commercial establishments (also known as man-trap doors) and as described in U.S. Pat. No. 6,308,644, titled ???Fail-Safe Access Control Chamber Security System,??? and U.S. Pat. No. 6,298,603, titled ???Access Control Vestibule,??? both by the instant inventor and both of which are expressly incorporated
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