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 5915-00-304-8195
NSN 5895-01-196-6286
NSN 5960-01-245-0029
NSN 5855-01-298-6659
NSN 5975-00-481-3681
NSN 6130-00-814-5888
NSN 5855-01-602-3437
NSN 5965-00-168-3608
NSN 5915-00-012-8599
NSN 5996-01-453-0752
NSN 5950-00-805-7620
NSN 6130-01-493-5832