International patent classification 
/ WIPO 
 - Geneva:   WIPO,   1999 
 - 7th ed. .
<br/><br/>Vol. 9 (Section H: Electricity); ISBN: 92-805-0798-2; 159p. 
<br/><br/><label>ISBN: </label>92-805-0798-2 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Library science
<br/><br/><label>Subjects--Index Terms: </label>Patent classification 
<br/><br/><label>Universal Decimal Class. No.: </label>D 025.4PATENt N9