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 6620-00-064-4964
NSN 5920-00-690-1930
NSN 2925-00-432-1807
NSN 6610-00-223-0930
NSN 5930-01-653-0103
NSN 5920-01-270-4562
NSN 6145-01-477-9541
NSN 5996-01-145-2784
NSN 5965-00-393-1294
NSN 6645-00-574-9712
NSN 6105-01-344-4705
NSN 5985-00-648-2081