| 41. | At its peak in the 1970s coal gas was provided to over 18, 000 customers in the city.
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| 42. | The small fruit bodies bear a distinctive smell of coal gas and appear in autumn on damp ground.
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| 43. | When he was exploiting a coal mine in Hunan in 1936, he was intoxicated by the coal gas.
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| 44. | His death was recorded as suicide by coal gas poisoning and was front page news in British tabloids.
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| 45. | He experimented with coal gas as a cheaper and more readily available alternative to hydrogen for lifting power.
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| 46. | Such explosions usually happen when sparks ignite coal gas that has accumulated due to lack of proper ventilation.
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| 47. | Many mines lack fans or other forms of ventilation to disperse volatile coal gas produced while mining . cxb
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| 48. | Mine explosions are usually caused by the ignition of dangerous concentrations of coal gas by sparks or open flames.
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| 49. | Such explosions usually occur when sparks ignite coal gas that has accumulated because of a lack of proper ventilation.
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| 50. | The wood-fueled gas is only half as powerful as coal gas, or a 10th as powerful as natural gas.
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