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 6240-01-510-4744
NSN 5910-01-224-8214
NSN 5950-01-098-3858
NSN 4140-00-597-5260
NSN 5975-01-576-2950
NSN 5996-01-565-3347
NSN 5905-00-227-5131
NSN 5925-00-581-6902
NSN 5945-01-553-6989
NSN 5930-00-155-5917
NSN 6610-00-234-3918
NSN 6610-00-835-7683