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 6620-00-051-7666
NSN 6110-01-381-1269
NSN 6320-01-170-4068
NSN 6110-01-499-4194
NSN 5999-01-583-5141
NSN 6220-01-514-2141
NSN 5999-00-728-4388
NSN 5965-00-153-5216
NSN 6645-01-376-2336
NSN 5945-01-593-0056
NSN 6105-00-096-5832
NSN 5905-00-707-1030