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 5996-00-920-4377
NSN 5855-01-426-5589
NSN 6220-00-863-7838
NSN 6145-01-209-5655
NSN 6105-01-245-2376
NSN 6620-00-133-0220
NSN 6620-01-608-8548
NSN 5998-01-526-7568
NSN 6320-00-701-0437
NSN 5999-00-008-8623
NSN 5945-01-060-0017
NSN 5990-01-555-6616