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 7035-01-265-0216
NSN 5965-01-399-8454
NSN 5920-01-052-5020
NSN 5996-01-423-9423
NSN 5975-01-252-6919
NSN 5855-01-554-5272
NSN 5915-00-509-7428
NSN 6150-01-499-0999
NSN 5965-01-323-8134
NSN 6130-01-168-1175
NSN 6650-01-185-2544
NSN 6645-01-521-3180