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 5996-01-654-1719
NSN 5999-01-477-5456
NSN 6320-00-925-0558
NSN 5975-01-553-5857
NSN 5930-01-212-9848
NSN 6220-01-521-7978
NSN 6610-00-371-5953
NSN 6150-01-326-1227
NSN 4140-01-025-1555
NSN 5990-01-529-6347
NSN 6320-00-004-9158
NSN 6610-00-155-1334