Mandell Irving <br/><br/>
How to protect and patent your invention 
Mandell Irving 
 - New York  Ocena Publications New     1951 
 - 1-80p  cm. 
<br/><br/><label>Standard No.: </label>25,967 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Dewey Class. No.: </label>Z73:2673, J1