what is CAD and history of CAD softwares?
CAD is short form of COMPUTER ADDED DESIGN Its mean a design which made by the help of computer is CAD. 1950 - 1970 The beginnings of CAD can be traced to the year 1957, when Dr. Patrick J. Hanratty developed PRONTO, the first commercial numerical-control programming system.He known as - "the father of CAD CAM" The first graphic system was also use in mid 1950 the US Air Force's SAGE (Semi Automatic Ground Environment) air defense system. The system was developed at Massachusetts Institute of Technology's Lincoln Laboratory. The system involved the use of CTR displays to show computer-processed radar data and other information. Later In 1960, Ivan Sutherland MIT's Lincoln Laboratory created SKETCHPAD , which demonstrated the basic principles and feasibility of computer technical drawing. their hard work and research give us great CAD system which make our production in every field very accurate and easy. best advantage of CAD software is