Mobile gas detecting unit with distance traveled marking means
作者： Heath Charles A , Holland John F
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lens.org 参考文章(4)
Earl R Thomas, Mobile gas detecting apparatus ,(1955)
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James F Rollins, Martin C Kelsey, Edward R Loyd, Natural gas leak detection ,(1960)
Henry Hartley, Vincent Canova, Speed and distance recorder for tram-cars, motor-cars, &c. ,(1904)