TY  - BOOK
ED  - Patent and Trademark Office <Washington>
TI  - Concordance: United States Patent Classification to International Patent Classification
SN  - 0-16-045497-2
PY  - 1995///
CY  - Washington: 
PB  - Patent and Trademark Office, 
KW  - Konkordanz
KW  - Patentklassen
KW  - USA
ER  -