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 5920-01-459-8057
NSN 5996-01-384-2115
NSN 7035-00-870-0290
NSN 6145-01-113-8205
NSN 6685-01-013-6499
NSN 5935-00-306-0987
NSN 6320-01-399-1633
NSN 6620-01-486-5123
NSN 5920-01-351-2193
NSN 6110-00-466-1674
NSN 5930-00-903-6719
NSN 5945-00-035-9251