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 5915-00-208-4686
NSN 5965-01-422-4823
NSN 6135-00-932-3136
NSN 5915-01-313-1625
NSN 5975-00-089-8693
NSN 5950-01-323-0197
NSN 5999-01-420-1227
NSN 6645-01-224-4265
NSN 6135-01-243-5797
NSN 6650-00-011-3435
NSN 5895-01-377-1645
NSN 5930-01-411-4980