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 5905-01-514-2886
NSN 5985-01-406-4274
NSN 5910-01-197-7358
NSN 6320-01-159-2211
NSN 6220-01-585-6892
NSN 5855-01-263-7669
NSN 6610-00-737-8660
NSN 6135-01-472-9011
NSN 5920-01-431-3263
NSN 6320-00-405-2348
NSN 5835-01-359-2575
NSN 5996-01-606-6603