Concordance :  United States Patent Classification to International Patent Classification 

 - 2000 Edition 
 - 205 S. 
<br/><br/><label>ISBN: </label>0-16-050220-9 
<br/><br/><label>Subjects--Topical Terms: </label><br/>USA<br/>Patentklassifikation<br/>Konkordanz<br/>Internationale Patentklassifikation