| 31. | Fuel cells were invented 156 years ago _ before the internal combustion engine.
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| 32. | It is much more complex when used with internal combustion engines.
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| 33. | Rotary mowers with internal combustion engines come in three price ranges.
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| 34. | It's powered by a supercharged hydrogen internal combustion engine and hybrid electric transmission.
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| 35. | As Ray says, " The internal combustion engine is so 20th century ."
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| 36. | A steam engine uses external combustion, as opposed to internal combustion.
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| 37. | The internal combustion engines were available in various rated power outputs.
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| 38. | It combined an internal combustion engine and an electric motor.
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| 39. | We have cars, not just ideas about internal combustion engines.
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| 40. | The internal combustion engine is understood from top to bottom.
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