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| Share | Phrase |
| 22.44% | recirculating pump |
| 11.89% | recirculating gas |
| 6.63% | recirculating burner |
| 6.51% | recirculating oil |
| 6.26% | recirculating furnace-dryer |
| 6.10% | recirculating passage |
| 4.23% | recirculating system |
| 4.22% | recirculating fuel |
| 3.75% | recirculating principle |
| 3.67% | recirculating device |
| 3.38% | recirculating ball |
| 2.87% | recirculating fluid |
| 2.49% | recirculating line |
| 2.23% | exhaust [physical/chemical] recirculating |
| 2.17% | recirculating flow |
| 2.12% | recirculating circuit |
| 1.64% | recirculating type |
| 1.53% | gas recirculating |
| 1.43% | recirculating means |
| 1.36% | fuel recirculating |
| 1.22% | recirculating operation |
| 0.94% | recirculating assembly |
| 0.78% | recirculating mechanism |
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