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 5915-01-415-3100
NSN 6610-00-737-0864
NSN 5895-01-414-6087
NSN 6685-01-091-6254
NSN 6150-00-027-1235
NSN 5950-01-644-6066
NSN 6220-01-482-5444
NSN 6240-01-310-1975
NSN 5999-01-449-4270
NSN 6130-01-424-6444
NSN 4140-00-531-6696
NSN 5950-00-100-5785