Electronic calculator pen

Abstract From the Canadian patent

A structure of electronic pen calculator is constructed by forming two rectangular windows in upper face of a pen body for accommodating a printed circuit board and exposing a keyboard and a LCD over those two windows wherein an inverse T-groove with a wide body and a narrow head is formed on back of the rectangular windows; top end of the pen body is sleeve-jointed with, a pen cap which is coupled to a clamping rod laterally; a protruded dot is formed on inner face at tail end of the clamping rod and a stopping rib is, disposed on opposite inner face of the pen cap; when the pen cap is sleeve-jointed onto the pen body, the stopping rib is embedded in the inverse T-groove, and the pen …