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据1980年6月出版的一期《石油工程师》杂志报导,美国著名的抽油机制造厂商拉夫金公司的一台抽油机,至今已工作了47年,运转400000小时以上,现仍在工作。
According to a report published in June 1980 by the “Petroleum Engineers” magazine, a pumping unit of the famous American oil pumping manufacturer Rafterjin has been in operation for 47 years and has operated for more than 400,000 hours and is still working .