|
1.
|
Buffalo, New York : The Patent and Trademark Office Society, 1997.
English | 47 US |
|
|
2.
|
Singapore : Butterworths, 1986.
English | F 16 PEN.I |
|
|
3.
|
Hong Kong : Government Printer (AUTHORITY), Hong Kon, 1969.
English | B 31 LET |
|
|
4.
|
London, England : Sweet & Maxwell, 1982.
French | 10 GB |
|