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 5975-01-365-5440
NSN 6650-01-433-1911
NSN 6135-00-505-0679
NSN 5930-01-641-4387
NSN 5905-00-470-5395
NSN 5835-00-905-7165
NSN 6145-01-205-5936
NSN 5950-00-984-1514
NSN 6645-00-508-5723
NSN 5996-01-648-4989
NSN 5996-00-598-4839
NSN 7035-00-470-4977