Mann Guravtar Singh <br/><br/>
Improve the machinability of 20mncr5 steel and tool life of drill bit through an 
Mann Guravtar Singh 
 - Dr   B R 
 - Jalandhar  Dr   B R  Ambedkar  National institute o  2014 
 - 87 
<br/><br/><label>Dewey Class. No.: </label>621.9  / MA-I