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 5996-01-299-7275
NSN 7035-00-337-8745
NSN 5935-00-116-8695
NSN 6135-01-068-0119
NSN 6645-00-017-8252
NSN 6145-01-350-9918
NSN 6685-00-269-8969
NSN 6240-00-874-3533
NSN 6320-01-029-4220
NSN 5920-00-152-4003
NSN 5960-01-051-9405
NSN 5990-01-346-8782