Electric interlocking handbook by the Engineering staff of the General railway signal company
By: with an introduction by Wilmer W. Salmon ... Henry M. Sperry, editor ... Paul E. Carter, assistant editor; Sherman A. Benedict, illustrator ...
Contributors: Sperry, Henry Muhlenberg, 1861-; Carter, Paul E.
Publisher: General railway signal company
Published: 1917
Place of publication: Rochester, N. Y
Subjects: Railroads -- Signaling -- Interlocking systems