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 5905-01-252-2479
NSN 6110-01-499-1282
NSN 2925-00-964-7128
NSN 5965-01-532-5894
NSN 6220-01-510-1588
NSN 6645-01-036-5027
NSN 5910-01-377-9956
NSN 6645-01-627-6161
NSN 5930-01-607-0885
NSN 5985-01-360-9051
NSN 6220-00-802-3369
NSN 5945-01-295-7467