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 5910-01-201-4462
NSN 6145-00-606-5745
NSN 5950-01-454-5251
NSN 5920-01-442-4937
NSN 6135-00-782-6988
NSN 6610-00-968-8193
NSN 5999-01-415-7079
NSN 6650-00-021-2467
NSN 6135-01-508-6083
NSN 5920-01-179-0340
NSN 6645-00-246-4934
NSN 6320-00-405-2348