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 5945-01-478-3462
NSN 5920-01-103-4526
NSN 5990-01-160-6978
NSN 6645-00-975-6941
NSN 4140-01-512-0744
NSN 5930-01-113-4840
NSN 5999-01-052-5566
NSN 5950-01-350-7249
NSN 6130-01-242-9714
NSN 6220-00-696-1519
NSN 5999-01-595-9556
NSN 6650-00-361-8222