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 5975-00-202-5013
NSN 5998-00-463-7158
NSN 5910-01-359-7534
NSN 5910-01-103-2282
NSN 6130-00-528-1266
NSN 6135-01-594-9930
NSN 6320-00-809-5744
NSN 5998-01-160-7543
NSN 5996-00-553-7348
NSN 5965-00-170-5254
NSN 5855-00-797-8217
NSN 6110-01-068-0301