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 6620-01-390-9551
NSN 6105-00-546-5148
NSN 5975-00-387-6515
NSN 5835-00-310-6807
NSN 5920-00-483-1597
NSN 5925-01-248-0738
NSN 5998-01-632-6211
NSN 6610-00-557-3408
NSN 6105-00-446-9271
NSN 6610-00-594-6372
NSN 5998-01-306-4098
NSN 6645-00-144-4868