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 6240-01-133-4551
NSN 6685-01-188-7379
NSN 5925-01-577-7774
NSN 5999-01-595-7116
NSN 6685-01-338-6131
NSN 6620-01-257-6483
NSN 5935-00-925-2536
NSN 7035-01-292-2580
NSN 6145-00-578-7522
NSN 5855-01-145-8973
NSN 5945-01-223-6334
NSN 5835-00-286-5432