True Sounds
1st October 2008, 12:38 AM
http://www.freepatentsonline.com/5656794.html
http://publications.drdo.gov.in/gsdl/collect/defences/index/assoc/HASH0101/d562d035.dir/doc.pdf
http://publications.drdo.gov.in/gsdl/collect/defences/index/assoc/HASH0101/d562d035.dir/doc.pdf