Hassand Khan Afridi & Muhammad Aqib Suhail CNC Based Pen Plotter Plus Etching Module - Karachi: UIT, 2016 Standard No.: 16B-135-EL & 16B-136-EL Subjects--Personal Names: Electronic Engineering Subjects--Topical Terms: Bachelor of Engineering (BE) Dewey Class. No.: 004.7092 HAS