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 6105-01-342-5152
NSN 5945-00-056-8136
NSN 5835-01-152-9483
NSN 6645-00-068-3536
NSN 6610-01-519-8953
NSN 5925-00-781-7988
NSN 5835-01-426-6573
NSN 6145-01-130-5416
NSN 6645-00-303-7698
NSN 4140-01-088-0401
NSN 5975-01-267-1533
NSN 5915-01-127-3854