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 6645-01-624-4351
NSN 5905-01-609-4728
NSN 6135-00-194-9354
NSN 6135-00-128-1633
NSN 6135-00-016-0071
NSN 6240-01-441-0784
NSN 6135-01-281-4758
NSN 6320-01-202-8761
NSN 5920-01-425-5700
NSN 6105-01-422-8139
NSN 5835-00-752-6065
NSN 5998-00-969-4793