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 6685-01-416-0106
NSN 5930-01-147-4841
NSN 5935-00-944-2635
NSN 6320-01-160-7757
NSN 6620-00-176-5722
NSN 5999-01-051-2372
NSN 5975-01-303-7189
NSN 5855-01-398-9548
NSN 5999-01-174-2256
NSN 5990-01-048-9536
NSN 5990-01-157-0441
NSN 5960-00-173-6988