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- 07040015 contributor B415603.
- 07040015 created "[c1907]".
- 07040015 date "1907".
- 07040015 date "[c1907]".
- 07040015 dateCopyrighted "[c1907]".
- 07040015 extent "5 p. l., 80, [3] p.".
- 07040015 issued "1907".
- 07040015 issued "[c1907]".
- 07040015 language "eng".
- 07040015 publisher "East Orange, N.J., F.C. Lavarack".
- 07040015 subject "Railroads Signaling Interlocking systems.".
- 07040015 subject "TF635 .L37".
- 07040015 title "Locking; being an elementary treatise on the mechanisms in interlocking lever machines by which the movements of the levers are restricted to certain predetermined ways, rendering it impossible to operate conflicting switches and signals on railways. By Frederick C. Lavarack.".
- 07040015 type "text".