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 5905-01-627-7176
NSN 5965-00-594-3115
NSN 5985-00-652-1631
NSN 5930-01-218-4533
NSN 5920-01-496-2513
NSN 6135-00-050-7189
NSN 5975-00-099-9312
NSN 5975-00-288-5877
NSN 6135-01-187-0033
NSN 6150-00-826-6567
NSN 6135-00-191-6444
NSN 2925-01-532-0781