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 5910-01-525-7733
NSN 6135-00-488-4478
NSN 5960-00-074-8968
NSN 6685-01-562-8581
NSN 5950-01-394-9382
NSN 5935-00-100-5234
NSN 6220-00-420-1245
NSN 6645-01-071-0727
NSN 6130-01-059-7097
NSN 5999-01-485-9650
NSN 5925-01-015-7873
NSN 5905-01-369-7057