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Ground wires are an efficient protection for transmission lines , and if several are used , partially surrounding the ... defense against lightning , though arresters will still be necessary to prevent trouble from arcing grounds .
If the photographs are taken before the ground control has been established , points with little or no displacement and which can be identified on the photographs ( as intersections of roads with other roads , railways and streams ) are ...
... per man per day Man - hr of work in thousands ) Kind of mine Number of mines Underground Surface Opencut Total Underground Surface Opencut Total Underground Surface Open- | Undercut ground Surface Opencut Total 94 174 6 203 7 691 2 ...
Apa yang dikatakan orang - Tulis resensi
LibraryThing ReviewUlasan Pengguna - wackyvorlon - LibraryThing
I only have the second volume of this work, and I love it! Found at a local Value Village, it is filled with fascinating information. Details of all aspects of mine engineering, including compressed air, ventilation, and supporting structures. Baca ulasan lengkap
Conditions Methods in General
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