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 2925-01-139-5144
NSN 5998-01-487-6160
NSN 6220-01-079-6244
NSN 5996-00-753-1599
NSN 6320-00-225-7013
NSN 5920-01-520-6122
NSN 6145-00-846-0974
NSN 6685-00-622-2167
NSN 5999-00-760-7128
NSN 5905-01-353-7339
NSN 6220-00-338-1086
NSN 5965-01-386-2988