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 5905-00-198-4579
NSN 5930-01-310-5896
NSN 5950-01-193-1467
NSN 6150-01-428-6755
NSN 6220-00-577-3434
NSN 5975-00-275-1962
NSN 5835-00-289-9080
NSN 6645-00-807-9350
NSN 5930-01-521-3881
NSN 6320-01-054-3046
NSN 5960-01-109-4828
NSN 5985-01-183-4132