Safe mechanical equipment for use in shaft sinking
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| Formato: | Libro |
| Lenguaje: | English |
| Publicado: |
Washington :
Government Printing Office,
1922.
|
| Colección: | Technical Paper ;
276 |
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| Institución: | Library of the Academy of Sciences of the Czech Republic |
| All Items of this Institution: | all items available from Library of the Academy of Sciences of the Czech Republic |
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The golden shaft 
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