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 6610-01-453-4269
NSN 5895-01-586-1958
NSN 5999-00-239-7358
NSN 6320-01-176-8367
NSN 5855-01-431-8937
NSN 5975-01-517-8254
NSN 5985-01-406-5209
NSN 6240-01-633-9357
NSN 5835-01-463-2334
NSN 5925-01-229-8659
NSN 6135-00-170-8819
NSN 5905-01-316-6665