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 6685-01-471-0968
NSN 5998-00-577-3519
NSN 5965-01-204-8505
NSN 5930-00-975-2100
NSN 5930-01-388-5897
NSN 6105-00-145-7233
NSN 5985-01-223-0840
NSN 2925-00-546-3129
NSN 5950-01-293-0526
NSN 6645-00-124-9939
NSN 6110-01-454-6735
NSN 6110-00-322-7059