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 6650-00-071-8184
NSN 6645-00-760-5599
NSN 7035-00-295-0451
NSN 6220-01-382-7740
NSN 6320-00-925-0558
NSN 6650-01-012-3290
NSN 5835-01-589-4735
NSN 5998-00-389-8400
NSN 6650-01-136-1520
NSN 5950-01-407-5574
NSN 5998-01-188-7975
NSN 5999-01-024-1867