Show unique time sav device A unique time saving device is to tie used in the office of one of new ork s large drug companies over the desks of each member of the firm and each manager of a department are tour incandescent Incan descant lights of differ ent colors when the individual la at his desk and at liberty to con sider questions from others in the office his white light is turned on when he is in the building and must be hunted up he leaves his green light burning when he Is engaged and not to be disturbed except for vitally important matters his blue light is in evidence while the dis play ot his red light means practical ly danger will not brook inter under any consideration |