Region
California
2
Canada
1
Chennai
1
China
2
Cuba
1
Digital techniques
1
Duitsland
1
Europe
6
France
2
Germany
2
Germany (East)
1
Great Britain
5
India
5
Italy
3
Japan
5
Los Angeles
2
Madras
1
Paris
1
Paris (France)
1
Québec (Province)
1
Russia
1
Shanghai
2
Spain
2
Sweden
1
Switerland
1
Switzerland
2
United States
68