| http://www.w3.org/ns/prov#value | - Apparatus for detecting the presence of an object in a work area having an exit, the apparatus comprising:(a) means for emitting radiant energy along a plurality of paths within said work area, said paths being disposed in an array including paths disposed closer to and further from said exit; (b) means for detecting the energy emitted along each path and providing a blocked-path signal associated
|
