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 6320-00-553-8427
NSN 2925-01-545-2717
NSN 5960-00-114-4916
NSN 6240-00-079-0112
NSN 6135-00-027-3914
NSN 5950-01-391-7174
NSN 5950-01-528-7982
NSN 5920-01-095-3894
NSN 6685-00-890-5261
NSN 5930-00-825-5244
NSN 6110-01-198-6154
NSN 7035-01-236-5743