| |||
| grabación magnética con exploración helicoidal; magnetoscopio helicoidal | |||
|
helical scan : 5 phrases in 4 subjects |
| Communications | 1 |
| Electronics | 2 |
| Municipal planning | 1 |
| Video recording | 1 |
| |||
| grabación magnética con exploración helicoidal; magnetoscopio helicoidal | |||
|
helical scan : 5 phrases in 4 subjects |
| Communications | 1 |
| Electronics | 2 |
| Municipal planning | 1 |
| Video recording | 1 |