http://books.google.lv/books?id=eMqVygLDSa0C&pg=PA577&lpg=PA577&dq=spiral+spring+technical+drawing&source=bl&ots=CEuqQgzBag&sig=UmYDDObVZ37I1sQYG0hrMKIA93w&hl=lv&ei=8_-kS5X4G-alsQb27tTwCA&sa=X&oi=book_result&ct=result&resnum=4&ved=0CBsQ6AEwAw#v=onepage&q=spiral%20spring%20technical%20drawing&f=false
http://www.allrite.com/compdwg.pdf
http://www.terawatt.com/cms/special/design2.php
...
http://www.allrite.com/compdwg.pdf
http://www.terawatt.com/cms/special/design2.php
...
pirms 15 gadiem
500