ascertained+principle
131F-number — In optics, the f number (sometimes called focal ratio, f ratio, or relative aperture [Smith, Warren Modern Lens Design 2005 McGraw Hill] ) of an optical system expresses the diameter of the entrance pupil in terms of the focal length of the lens; …
132Keretapi Tanah Melayu — Malayan Railway (Malay) Keretapi Tanah Melayu Locale Peninsular Malaysia Dates of operation 1885– …
