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 6135-00-819-8074
NSN 5915-01-410-6838
NSN 5905-00-922-2942
NSN 5975-01-399-4332
NSN 5990-00-440-6532
NSN 5905-01-650-6075
NSN 6610-00-898-2166
NSN 5895-01-330-0282
NSN 6650-01-382-7842
NSN 6130-01-462-2425
NSN 6130-01-366-5008
NSN 6620-01-004-7072