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 6650-01-359-1770
NSN 5990-01-436-7191
NSN 5895-01-449-8701
NSN 5990-01-015-5968
NSN 7035-01-477-4181
NSN 5930-01-097-0211
NSN 2925-01-567-8027
NSN 5930-00-646-7031
NSN 6320-01-198-4024
NSN 5950-01-421-7959
NSN 5930-01-580-2587
NSN 6220-00-541-8515