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 6610-01-171-1058
NSN 5905-00-525-3747
NSN 5965-01-508-1093
NSN 6320-00-194-4252
NSN 6650-00-896-9468
NSN 7035-00-500-7839
NSN 5965-00-088-1722
NSN 6220-01-425-3804
NSN 6645-00-097-4613
NSN 5975-00-904-0002
NSN 5998-00-981-1939
NSN 5930-01-508-9331