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 5930-00-275-3129
NSN 5975-00-944-8484
NSN 6105-00-267-6954
NSN 5996-01-393-7166
NSN 4140-01-514-2319
NSN 4140-01-500-8674
NSN 5920-01-042-6680
NSN 6130-01-431-6942
NSN 5905-00-372-5214
NSN 6130-01-602-6392
NSN 5960-01-167-2137
NSN 5910-01-237-2449