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 2925-01-359-4027
NSN 5965-01-457-7297
NSN 6135-01-341-5324
NSN 5999-01-153-7416
NSN 6145-01-230-3595
NSN 5930-00-269-3685
NSN 5930-01-157-9675
NSN 6620-00-420-8455
NSN 5999-01-525-7770
NSN 6150-00-269-5017
NSN 6145-01-435-7152
NSN 5945-00-953-4142