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 5835-01-286-6499
NSN 5999-01-067-9985
NSN 7035-00-679-9027
NSN 6145-00-080-3421
NSN 5996-01-230-8671
NSN 5930-00-918-8377
NSN 6240-00-013-4764
NSN 5998-00-526-9253
NSN 6645-01-602-8275
NSN 5999-01-170-6059
NSN 5905-01-190-0213
NSN 5965-01-437-5934