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 5920-01-142-5750
NSN 6130-00-119-9170
NSN 2925-01-197-7864
NSN 5990-01-612-5323
NSN 6150-01-521-2581
NSN 5945-00-848-2576
NSN 5905-01-354-1528
NSN 5930-00-130-6377
NSN 6220-01-285-9683
NSN 7035-01-187-0266
NSN 5950-01-464-1089
NSN 6105-01-608-3974