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 2925-01-444-6676
NSN 6150-00-518-1402
NSN 6150-01-297-5110
NSN 5905-00-470-1998
NSN 5965-00-755-4657
NSN 5965-01-506-3320
NSN 6650-01-576-8520
NSN 5915-01-461-5595
NSN 6145-00-103-9848
NSN 6320-00-593-0379
NSN 6240-01-511-9778
NSN 5905-00-170-5500