During the MiddleAges, People had written by lead or silver stick, it says carvingrather than writing of this keeping words way. The first piece slicker-solderpencil...
Step 1   Processing plant send the powder or liquid synthetic rubber to eraser manufacturer. If it needs natural rubber, they will send solid big block, ...
In 1770, Engineer Edward Naina fromUnited Kingdominvented eraser after 200 years since pencil has been invented. Before this,People had to use bread to erase the scr...