TY  - BOOK
TI  - International classification of patents for invention under the European Convention of 19th December 1954: Vol. 1: A-B : Vol. 2: C-E , Vol 3: F-H
PY  - 1968///
CY  - London: 
PB  - Morgan-Grampian, 
KW  - Internationale Patentklassifikation
N1  - 14.832
ER  -