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 5945-00-273-9153
NSN 5920-01-631-2236
NSN 5905-01-049-4941
NSN 5965-01-627-6201
NSN 5910-01-395-0111
NSN 6645-00-678-0914
NSN 6645-00-918-3785
NSN 5835-01-619-6270
NSN 6685-00-068-0933
NSN 5965-01-463-8176
NSN 6685-01-167-8612
NSN 6110-01-122-5916