Keeran is considered a pioneer maker of mechanical pencils,[3] as the inventor of the first successful one.

The Advance also uses a mechanism which rotates at 2x the speed of some of the others with the stated intent of being geared towards western alphabet writing, as opposed to Japanese / Asian logograpic writing systems where the user picks up their pencil tip more frequently.

normal kurutoga was actually designed for writing Japanese strokes. The Advanced models were for writing English.