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 5975-01-312-8194
NSN 6220-01-296-1827
NSN 5945-00-008-4644
NSN 6620-01-210-9002
NSN 5998-00-891-5932
NSN 5835-01-659-5206
NSN 6130-00-522-5489
NSN 6685-01-032-5591
NSN 4140-00-959-4255
NSN 5985-01-582-7440
NSN 5975-00-288-5877
NSN 5855-00-908-9314