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 6320-01-373-9355
NSN 5855-00-763-2155
NSN 6135-01-205-5965
NSN 5996-01-343-7024
NSN 5975-01-158-5094
NSN 5950-01-155-5674
NSN 6685-01-068-4446
NSN 5895-00-246-4415
NSN 6685-01-323-7628
NSN 6130-01-444-5119
NSN 5965-01-367-2595
NSN 6645-01-022-2632