 |
| |||
| primary sources (Published and unpublished records without secondary interpretation or commentary) | |||
| original sources; primary literature | |||
| |||
| primary radiator | |||
| aerial feed; antenna feed | |||
|
sources primaires : 8 phrases in 4 subjects |
| Communications | 3 |
| Earth sciences | 2 |
| Energy industry | 2 |
| Finances | 1 |