| http://www.w3.org/ns/prov#value | - When the computer 1 is mounted on the mounting surface 381 in a state where an object such as a pencil, a pen and an eraser is on the mounting surface 381, if the computer 1 is pulled toward connector mounting surface 406 via the hook arm units 451, the hook arms 481 are not hooked to the engaging recesses 265a and 265b.
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