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It is a very lightweight design, and has very fast auto focusing even without USM.
en.wikipedia.org The USM allowed as little as 10% to be floated.
en.wikipedia.org As a university, the USM functions were mandated to have a trilogy of functions: instruction, research, and extension.
en.wikipedia.org As the official pre-game editor included in the game was poor, some USM users produced enhanced pre-game editors.
en.wikipedia.org In the late 1940s, USM increased its product lines with metal and sheet-metal work to respond to the post-war economy.
en.wikipedia.org