загвар төлөвлөгөө бөмбөг тээрэм бутлуурын
Charles Hard Townes (July 28, 1915 January 27, 2022) was an American physicist and inventor of the worked on the theory and appliion of the maser, for which he obtained the fundamental patent, and other work in quantum electronics associated with both maser and laser devices. цагаан тугалга уурхайн ...
