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 5910-01-354-1593
NSN 6145-00-646-0941
NSN 5965-01-061-6871
NSN 5975-00-339-3313
NSN 6130-01-333-2332
NSN 6620-01-111-0799
NSN 6105-00-877-2782
NSN 4140-00-606-5430
NSN 2925-00-561-9904
NSN 5895-01-051-2212
NSN 5996-00-428-8130
NSN 4140-01-528-6432