Entrance control device for sequential displacement of a plurality of barriers
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United States of America Patent
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Feb 13, 2001
Grant Date -
N/A
app pub date -
Mar 26, 1999
filing date -
Mar 26, 1999
priority date (Note) -
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Abstract
An entrance device having at least two barriers to permit entrance in one direction comprising a first barrier manually displaceable from a closed position to an open position and a second barrier manually displaceable from a closed position to an open position when said first barrier is being engaged to achieve said second open position wherein said first and second barriers are presented by said entrance device in sequence.
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