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 5950-00-331-7630
NSN 5855-01-010-4921
NSN 5910-01-457-7489
NSN 6145-01-424-1351
NSN 5998-00-936-9998
NSN 5960-01-502-6270
NSN 5950-01-506-7684
NSN 5965-01-530-9910
NSN 5950-01-232-7831
NSN 4140-00-776-5906
NSN 6240-00-438-6999
NSN 5960-00-533-1125