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 6130-00-724-9908
NSN 6135-01-574-6577
NSN 5945-00-110-0754
NSN 5905-01-649-5802
NSN 6240-01-420-2364
NSN 6220-00-831-5690
NSN 6645-01-169-3978
NSN 5965-01-076-0071
NSN 5950-01-294-4998
NSN 5920-01-292-7060
NSN 6110-00-101-7785
NSN 5950-01-401-5321