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 7035-01-029-7221
NSN 5855-00-198-3197
NSN 6130-01-122-6258
NSN 6130-01-555-9413
NSN 2925-01-226-6126
NSN 5996-00-466-9781
NSN 6145-01-111-2291
NSN 2925-01-190-0510
NSN 6320-00-164-4087
NSN 5975-00-244-0706
NSN 5925-01-435-9492
NSN 5975-00-894-9639