Patent office handbook 

 - 6th 
 - Delhi  Manager of publications India       1941 
 - vi,1-252p  cm. 
<br/><br/><label>Standard No.: </label>24,020 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Dewey Class. No.: </label>Z2:2673g, H1