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 5905-01-182-0731
NSN 6610-00-229-5785
NSN 6135-00-276-7625
NSN 6150-00-834-6049
NSN 5975-00-221-2555
NSN 5905-00-436-1124
NSN 6320-00-242-3300
NSN 6130-01-285-9151
NSN 5855-00-560-0110
NSN 5925-01-138-1786
NSN 6150-01-198-2070
NSN 5960-00-098-5117