Automatic power releases for shutting off power from mine and indicating by signal alarm when fan stops or doors are left open [microform]
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| Other Authors: | , |
|---|---|
| Format: | Government Document Microfilm Book |
| Language: | English |
| Published: |
Washington, D.C. :
[publisher not identified],
1930.
|
| Series: | Information circular (United States. Bureau of Mines) ;
6288. |
| Subjects: |
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Automatic power releases for shutting off power from mine and indicating by signal alarm when fan stops or doors are left open.
Published 1930
Full Text (via ProQuest)
Government Document
eBook