A transparent item of a predetermined size that permits unobstructed and undistorted view of a desired area. It may include a frame, have reference markings, grid lines and may be heat strengthened and/or tinted. It is generally used where safety, security, and/or the restriction of foreign matter are required, such as the visual examination of the inside of pressurized tanks, liquid sights, controlled liquid flow, and inspection of equipment enclosed in a housing. See window (as modified); scale, cathode ray tube; scale, plotting; window, metal; window, wood; and window panel, aircraft.
Classification: Pressed or molded glass articles, wired or not, for building or construction;leaded glass windows etc; formed multicellular or foam glass
NSN 5895-01-512-2407
NSN 5895-00-232-1314
NSN 5998-01-166-7101
NSN 2925-01-607-4340
NSN 6650-00-213-7065
NSN 6650-01-610-5856
NSN 5915-01-415-7240
NSN 2925-01-604-8984
NSN 6685-01-441-2198
NSN 5905-01-408-0138
NSN 5990-00-258-0228
NSN 5855-01-458-2229