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- 38019980 contributor B924059.
- 38019980 created "[c1937]".
- 38019980 date "1937".
- 38019980 date "[c1937]".
- 38019980 dateCopyrighted "[c1937]".
- 38019980 extent "165 p. incl. front., illus.".
- 38019980 issued "1937".
- 38019980 issued "[c1937]".
- 38019980 language "eng".
- 38019980 publisher "Rochester, N.Y., General railway signal company".
- 38019980 subject "625.16".
- 38019980 subject "Railroads Electric equipment.".
- 38019980 subject "Railroads Signaling.".
- 38019980 subject "TF639 .G4".
- 38019980 title "Centralized traffic control, type F, class M, duplex, coded system description of circuits.".
- 38019980 type "text".