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 6685-01-145-2478
NSN 6645-01-124-6277
NSN 5985-01-571-0364
NSN 5895-01-294-8565
NSN 4140-01-103-2216
NSN 6145-01-031-6739
NSN 5950-01-286-2175
NSN 5915-01-369-0811
NSN 5910-01-060-0080
NSN 5910-00-023-2355
NSN 5996-01-600-0348
NSN 2925-01-068-3844