ABACUS HAVING MEMO MEANS OF HINGE TYPE OPEN STRUCTURE

摘要

According to the present invention, the main plate body which is the main plate seen are arranged to enable the abacus; And the main plate is rotatably coupled with respect to one side edge of the body optionally provided with, note area exposed so bent from the bottom surface of the main plate body whiteboard; a main plate comprising a are provided.; Main plate according to the present invention is, with the abacus is possible that notes, there is provided with a hinged open structure of the whiteboard on the main plate body easy to carry and use, and the whole structure is simple advantages.