Its function is the same as the spring-type casing scraper, but it can decrease and even avoid that the scraped pipe-column falls in oil well.

作用同弹簧式刮削器，但可减少甚至避免刮削管柱落井。

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One iPhone is rumored to be an iPhone 5S, with upgrades akin to the upgrade from 4 to 4S, and another iPhone is rumored to be a slimmed down, less-expensive iPhone with a different type of casing, most likely in color.

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