Developments in telegraphy [electronic resource] : way-wires multiplexed and interchangeable / by D.H. Keeley.
|Main Author:||Keeley, D. H. b. 1858.|
[Montréal? : s.n., 1890?]
At head of title: (All rights reserved.) -(subject to revision) ... Canadian Society of Civil Engineers. Incorporated 1887 ...
"To be read on Thursday, 9th of October."
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