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 5930-01-582-7236
NSN 5998-00-263-7557
NSN 5998-00-732-0492
NSN 6320-01-506-9439
NSN 6650-01-412-2959
NSN 6645-01-230-6252
NSN 6320-01-305-5881
NSN 6610-00-711-2551
NSN 5910-01-313-5546
NSN 5965-01-463-2815
NSN 5999-01-101-1769
NSN 5835-01-303-6563