International Patent Classification :  Core Level ; Sections A and B ; Sections C and D ; Sections E and F ; Sections G and H ; Guide to the IPC 

 - 8. Ed. 
 - Getr. Zählung 
 - WIPO Publication  560 E/8 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Internationale Patentklassifikation