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 5950-01-056-1605
NSN 6110-01-295-6639
NSN 4140-01-350-8723
NSN 5945-00-820-6373
NSN 5998-01-364-5801
NSN 6650-00-302-3707
NSN 5855-01-222-1242
NSN 6130-01-153-2265
NSN 6150-01-447-7905
NSN 5910-01-550-4674
NSN 5925-01-515-7273
NSN 4140-00-988-5427