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 5915-01-136-4035
NSN 5905-01-111-5506
NSN 5925-01-535-1318
NSN 5835-01-143-9143
NSN 5905-01-422-3229
NSN 6645-00-936-9111
NSN 6240-01-586-0275
NSN 2925-00-932-6262
NSN 6135-00-405-1989
NSN 5950-00-180-9943
NSN 5975-01-359-4020
NSN 5835-00-928-5717