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 5950-01-348-8965
NSN 6145-00-807-5231
NSN 5975-01-344-0546
NSN 6240-00-127-7874
NSN 5990-01-315-3754
NSN 5895-01-334-7259
NSN 6685-00-417-3358
NSN 6610-00-186-3433
NSN 2925-01-359-4027
NSN 6105-00-936-9070
NSN 5965-01-606-2633
NSN 6620-01-656-7448