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 5915-01-647-4236
NSN 2925-01-421-0068
NSN 5920-00-858-8619
NSN 7035-01-227-2546
NSN 6645-01-336-5019
NSN 6130-01-057-8008
NSN 6320-00-228-5678
NSN 5985-01-083-0202
NSN 4140-01-364-6064
NSN 6145-01-444-3548
NSN 5960-00-492-2502
NSN 5998-01-273-9492