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 6320-01-390-5385
NSN 6620-01-013-5432
NSN 6650-01-089-7777
NSN 6620-00-197-5130
NSN 6610-01-633-8931
NSN 6320-01-214-0350
NSN 6110-01-263-3744
NSN 5925-00-279-6769
NSN 5910-00-059-3730
NSN 5965-01-424-0542
NSN 5996-01-565-8951
NSN 4140-00-994-0123