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 5910-01-423-3921
NSN 6145-00-757-2742
NSN 5835-00-987-9341
NSN 6110-01-359-2743
NSN 6685-00-878-3878
NSN 5985-01-252-4016
NSN 6620-01-072-9372
NSN 6105-00-915-6601
NSN 5996-01-054-4954
NSN 4140-00-269-5795
NSN 5975-01-038-8707
NSN 5835-00-143-4153