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 5935-01-598-9234
NSN 6110-00-721-4042
NSN 5998-01-425-1354
NSN 5910-01-353-0004
NSN 5998-00-899-7002
NSN 6685-01-508-5432
NSN 5895-01-426-5564
NSN 5835-00-133-9186
NSN 5965-01-056-1180
NSN 5975-01-396-1599
NSN 5935-01-420-6203
NSN 5895-01-592-3237