Centralized traffic control : type F, class M, duplex, coded system description of circuits.
| Corporate Author: | |
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| Format: | Book |
| Language: | English |
| Published: |
Rochester, N.Y. :
General Railway Signal Company,
1937.
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| Subjects: |
| Item Description: | "Handbook 15 ... March, 1937." |
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| Physical Description: | 165 pages : illustrations (part folded) ; 23 cm. |