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 5945-01-534-3291
NSN 6650-01-492-1440
NSN 6135-00-819-8074
NSN 6610-00-747-9922
NSN 6650-01-135-9670
NSN 5965-00-990-8669
NSN 5910-01-053-2885
NSN 5985-00-221-1563
NSN 5855-01-607-6521
NSN 5855-00-688-9954
NSN 7035-01-065-8703
NSN 5975-00-266-2029