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 6110-01-261-4980
NSN 5925-01-450-4759
NSN 5960-01-560-8461
NSN 5998-01-568-2560
NSN 5975-01-250-6028
NSN 6620-00-684-3425
NSN 6145-01-433-6858
NSN 5998-01-261-1629
NSN 5999-01-374-2448
NSN 5965-01-168-8180
NSN 7035-01-107-2811
NSN 5950-01-430-5502