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 6645-00-521-0353
NSN 6645-01-376-2336
NSN 5990-01-312-2638
NSN 5965-01-519-8758
NSN 5915-00-518-0851
NSN 7035-00-300-3208
NSN 7035-01-450-2289
NSN 6320-01-054-3046
NSN 5990-01-255-7387
NSN 6130-00-924-6238
NSN 6220-01-296-3385
NSN 5960-00-636-4834