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 6620-00-035-5813
NSN 5950-01-187-2735
NSN 5990-00-474-5609
NSN 6130-01-255-7990
NSN 6645-01-370-4259
NSN 6105-01-069-3693
NSN 6105-00-826-9264
NSN 6130-01-020-6314
NSN 5975-01-391-7356
NSN 5950-01-630-1413
NSN 5920-01-514-4095
NSN 6240-01-515-8746