PURPOSE: A binder ballpoint is provided to enable a user to conveniently confirm a date and to enable the user to do various activities at one time by combining a calendar and a compass and making the middle of a ballpoint have a convex shape.;CONSTITUTION: A binder ballpoint has a structure in which a calendar and a compass are combined. The middle part of a ballpoint and a mechanical pencil has a convex shape. The binder ballpoint is obtained by inserting a binder into middle part of the ballpoint. The calendar is included in the middle part of the ballpoint to enable a user to conveniently confirm a date.;COPYRIGHT KIPO 2010
展开▼
