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 5998-01-200-0641
NSN 5998-01-554-0823
NSN 5965-00-926-2591
NSN 5925-00-829-4897
NSN 5965-01-155-3131
NSN 6150-00-990-6233
NSN 5950-00-957-8799
NSN 6650-01-356-5947
NSN 5985-01-644-6096
NSN 5950-01-555-8152
NSN 5905-00-483-5601
NSN 6645-01-218-5234