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 6130-01-263-8756
NSN 6610-01-586-5221
NSN 6650-00-864-2942
NSN 6135-00-221-4720
NSN 6650-01-386-6278
NSN 6130-01-544-7811
NSN 2925-01-065-0060
NSN 5905-00-466-1251
NSN 5920-01-035-7713
NSN 7035-01-421-2398
NSN 5910-01-196-6153
NSN 5998-00-306-4453