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 6320-01-198-4024
NSN 5990-01-243-4233
NSN 5996-00-166-0037
NSN 6145-01-386-4299
NSN 6645-00-130-8464
NSN 6645-01-499-1434
NSN 5835-00-924-4268
NSN 6220-01-115-8186
NSN 6650-00-196-5311
NSN 6220-00-557-4114
NSN 6320-01-554-0901
NSN 5950-00-225-2862