| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| invention of the machine gun | 1.17 | 0.6 | 1621 | 88 |
| machine gun invention date | 0.09 | 0.6 | 870 | 86 |
| machine gun invention year | 1.48 | 0.8 | 6132 | 69 |
| invention of the machine gun ww1 | 0.3 | 0.2 | 9466 | 49 |
| invention of the maxim machine gun | 0.22 | 0.5 | 4308 | 77 |
| who created the machine gun | 0.08 | 0.6 | 6561 | 52 |
| what country invented the machine gun | 0.28 | 0.9 | 1538 | 45 |
| history of machine gun | 0.05 | 0.3 | 2314 | 91 |
| when was machine guns invented | 1.52 | 0.4 | 4749 | 19 |
| machine gun invention | 0.39 | 0.7 | 6525 | 52 |
| when were machine guns created | 0.12 | 1 | 2831 | 39 |
| history of machine guns | 0.55 | 0.1 | 5417 | 96 |
