spring butt rocking door 客车摆门
double action spring butt hinge 双面弹簧铰链
spring butt hinge 弹簧铰链
butt plate buffer spring 托底板缓冲簧
Ramon Ramirez, a forgettable Mets relief pitcher in 2012, was in spring training with the San Francisco Giants last month when the butt dialer struck.
WSJ: The King of the Accidental Phone Call
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