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 6685-01-158-0975
NSN 5835-01-527-2629
NSN 5960-00-904-0294
NSN 5996-00-896-3625
NSN 5965-01-326-0606
NSN 6110-01-139-4646
NSN 5945-01-021-6177
NSN 6610-01-056-7499
NSN 6220-01-029-0245
NSN 5905-01-397-4425
NSN 6145-00-051-6021
NSN 6620-00-891-2225