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 6135-01-010-0891
NSN 6145-00-240-9795
NSN 6110-01-235-8512
NSN 6135-00-334-4500
NSN 5915-00-492-1474
NSN 6685-01-242-2187
NSN 5999-01-381-6548
NSN 6685-00-147-5841
NSN 6645-01-338-9152
NSN 5925-01-420-4033
NSN 5985-01-174-2622
NSN 6685-00-935-6961