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 2925-01-168-6253
NSN 6685-00-357-1102
NSN 6145-01-057-8344
NSN 6135-01-077-5705
NSN 5910-01-604-8394
NSN 5835-01-565-3411
NSN 5999-01-120-6719
NSN 6320-01-567-7198
NSN 5915-01-294-4734
NSN 6240-01-110-4166
NSN 6650-01-071-1234
NSN 6610-01-434-4958