-
the first patent for pencil sharpeners happened then...Bernard Lassimonne was the one who did this...This sharpener had small metal files set at 90 degrees in a block of wood and it grinded the edges of the pencil’s tip. This method wasn’t any faster or easier than sharpening with a knife, so it didn’t become popular
-
This is the time between the first one and its soon to be 2.0 version
1829-1846 -
was made in a more recognizable form in 1847 by...Thierry Des Estivaux
-
This is when version 3.0 is on the rise during 1848 and 1895
-
improved the last design to look like this
-
solved a problem the ones before it had not, making it more useful
-
This is the magical time period where it took only a year to come up with version 4.0
-
A.B. Dick Planetary Pencil Pointer
-
milling disks with a cylindrical cutting head with spiral cutting edges in the same planetary mechanism that was used in Pencil Pointer
