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: |
Norlin Library - Government Information - Microform
| Call Number: |
EBD C22.11-6288
|
|---|---|
| EBD C22.11-6288 | Restricted Place a Hold |