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Gas Bag Car

Natural gas is odorless, colorless, and tasteless

most gas utilities, adds mercaptan odorants, a commercial blends of sulfur compounds with a distinctive "rotten egg" smell.

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National Benzole was petrol with benzole added. From after WWI to 1950s the proportions were 50/50 but then the proportion of benzole was reduced until eliminated by 1960 and National Benzole changed its brand image to National. National was finally absorbed into the BP brand in the 1970s with whom it had had a petrol supply agreement for many years having no refineries of its own.
 
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