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 6320-01-386-9104
NSN 5920-01-023-0040
NSN 5930-01-398-0656
NSN 2925-00-808-5077
NSN 6145-01-540-7751
NSN 5999-01-206-4657
NSN 6685-00-005-9596
NSN 5855-01-297-1886
NSN 6110-01-397-2885
NSN 5950-01-179-1515
NSN 5895-01-085-4318
NSN 7035-01-304-0305