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 6220-01-277-5812
NSN 6650-01-426-4253
NSN 6610-01-399-5222
NSN 5905-00-389-6252
NSN 6645-01-519-3007
NSN 5996-01-429-0390
NSN 5945-01-641-2789
NSN 5855-00-879-5849
NSN 6645-00-163-9580
NSN 5998-01-083-0118
NSN 5925-01-452-1355
NSN 4140-00-396-0307