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 6105-01-440-8922
NSN 6130-01-426-3469
NSN 5945-01-351-5354
NSN 6610-01-652-1832
NSN 5905-00-133-5337
NSN 5910-01-099-6531
NSN 5975-01-578-6278
NSN 6650-01-399-8552
NSN 5930-01-617-6430
NSN 5925-00-165-0371
NSN 5910-01-510-3935
NSN 4140-01-477-5472