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 5950-01-375-3528
NSN 6135-00-918-6993
NSN 6145-01-488-1256
NSN 5915-01-295-5045
NSN 5905-01-366-0803
NSN 6150-01-007-7136
NSN 7035-01-422-5297
NSN 6650-00-944-8925
NSN 5998-01-633-6325
NSN 4140-01-600-6117
NSN 6685-00-061-8910
NSN 5950-01-165-9771