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 6135-01-255-9129
NSN 6135-00-833-9909
NSN 5905-01-529-6604
NSN 5915-01-644-0912
NSN 5910-01-196-6153
NSN 6150-01-653-9654
NSN 5855-00-925-0114
NSN 5935-01-335-6088
NSN 7035-00-312-3055
NSN 5996-01-622-6420
NSN 6645-00-841-0026
NSN 6320-01-315-9257