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 6220-01-365-7989
NSN 7035-00-803-3056
NSN 5990-01-336-3976
NSN 5855-01-100-3272
NSN 5950-00-937-6287
NSN 6145-01-258-6673
NSN 6150-01-378-1200
NSN 5910-01-195-0668
NSN 6645-01-231-2432
NSN 5960-00-081-0581
NSN 5985-01-530-7326
NSN 5996-01-221-6711