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 6150-01-503-9147
NSN 5855-01-095-5299
NSN 6150-00-989-2169
NSN 7035-01-026-1171
NSN 5855-00-014-5008
NSN 5998-01-119-6758
NSN 6645-01-626-6643
NSN 5960-01-203-9814
NSN 7035-01-255-2332
NSN 6240-00-258-2389
NSN 6145-01-423-8470
NSN 6645-01-504-3394