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 6240-01-312-2061
NSN 6645-00-960-6594
NSN 5999-01-423-1030
NSN 6145-01-417-4552
NSN 6610-01-086-9545
NSN 6685-00-484-2167
NSN 5910-01-106-3261
NSN 5950-00-510-9943
NSN 5835-01-118-4690
NSN 5910-01-167-0331
NSN 6105-00-925-2226
NSN 6240-01-249-9840