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 5975-00-857-3515
NSN 5960-00-311-8787
NSN 5960-01-609-6565
NSN 5910-01-280-1101
NSN 5925-00-760-0956
NSN 6150-01-456-5033
NSN 7035-01-320-7453
NSN 5835-01-578-3443
NSN 5960-00-315-0358
NSN 5999-01-035-7298
NSN 6145-01-010-4438
NSN 5985-01-378-9829