International patent classification 
/ WIPO 
 - Geneva:   WIPO,   1994 
 - 6th ed. .
<br/><br/>Vol. 6 (Section F: Mechanical engineering; lighting; heating; weapons; blasting); ISBN: 92-805-0507-X ;198p. 
<br/><br/><label>ISBN: </label>92-805-0507-6 
<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 N4.6