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 5925-01-517-5137
NSN 5910-01-519-1281
NSN 5950-01-136-8628
NSN 5855-01-485-3429
NSN 5950-01-063-7181
NSN 6135-00-062-5080
NSN 6610-00-133-7868
NSN 6145-00-467-0569
NSN 6645-01-469-9094
NSN 6220-01-123-9290
NSN 5930-00-444-5844
NSN 4140-00-892-5952