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 6645-00-485-1440
NSN 5999-01-551-7390
NSN 4140-00-373-4833
NSN 4140-01-231-8578
NSN 5950-00-828-6102
NSN 5905-01-198-3881
NSN 6645-01-014-9205
NSN 5999-00-815-0526
NSN 6240-00-950-3859
NSN 6110-01-559-6989
NSN 5930-01-606-5229
NSN 6135-01-435-8451