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 6220-01-302-1350
NSN 4140-00-555-3856
NSN 5965-01-172-5724
NSN 6645-01-370-7380
NSN 5835-01-408-7576
NSN 5910-00-990-0031
NSN 5920-01-540-8043
NSN 6320-01-461-1390
NSN 6685-00-335-5884
NSN 7035-01-433-8021
NSN 5965-00-463-3900
NSN 5998-00-224-2582