A nose edge of a step of a stairway is to be marked by a lighted strip which can be seen by a person going upstairs and by a person going downstairs. This is to be accomplished by a nosing bar assembly which comprises a single illuminating device and in which transparent covering means for such illuminating...http://www.google.se/patents/US4625266?utm_source=gb-gplus-sharePatent US4625266 - Lightable nosing bar assembly for stairways
