A photoelectric smoke detector includes a smoke detecting section defining a smoke detecting space, a light emission section holder having a light-emission element disposed in the smoke detecting section, and a light receiving section holder having a light-receiving element disposed in the smoke detecting...http://www.google.es/patents/US6288647?utm_source=gb-gplus-sharePatente US6288647 - Photoelectric smoke detector, and smoke detection section assembly
Photoelectric smoke detector, and smoke detection section assembly
