| Keyword | CPC | PCC | Volume | Score | Length of keyword |
|---|---|---|---|---|---|
| who used vacuum tubes | 1.56 | 0.4 | 6345 | 98 | 21 |
| who | 0.07 | 1 | 3625 | 18 | 3 |
| used | 1.18 | 0.2 | 6947 | 91 | 4 |
| vacuum | 0.85 | 0.9 | 7623 | 94 | 6 |
| tubes | 0.55 | 0.3 | 5017 | 94 | 5 |
| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| who used vacuum tubes | 1.57 | 0.6 | 7571 | 58 |
