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 6685-00-177-6491
NSN 5996-01-322-5587
NSN 5895-00-915-6403
NSN 5960-01-560-8461
NSN 5925-00-529-3950
NSN 6135-01-010-0891
NSN 6135-01-322-4655
NSN 6320-00-382-7825
NSN 6110-00-707-9869
NSN 5910-01-376-9377
NSN 5915-01-307-8854
NSN 6320-01-278-9832