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 5930-01-104-6010
NSN 5895-00-409-2082
NSN 5910-01-354-8090
NSN 5975-01-145-1355
NSN 5915-01-050-7361
NSN 5915-01-250-2451
NSN 5905-01-138-9522
NSN 5996-01-344-1371
NSN 5895-01-368-3961
NSN 5915-00-658-3458
NSN 5965-01-029-5222
NSN 5930-00-007-8727