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 6135-01-430-3119
NSN 6220-00-376-8103
NSN 5915-01-612-0100
NSN 5960-01-204-5820
NSN 6610-01-487-6843
NSN 5990-01-173-9531
NSN 6645-00-881-1075
NSN 5835-00-198-4936
NSN 6130-01-317-9238
NSN 6130-01-230-3210
NSN 6130-01-580-3312
NSN 5945-01-015-4641