| http://www.w3.org/ns/prov#value | - Shirley, U.S. Pat. No. 4,682,155 teaches a security sensing system which monitors the passages of persons through a door or like opening, the system being particularly useful in nursing homes for the aged, institutions for mentally incompetent persons and similar places where there is a need to alert the staff to any unauthorized departure of a resident through a door.
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