An edition of Locking (1907)
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 Charles Lavarack
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Publish Date
1907
Publisher
F.C. Lavarack
Language
eng
Pages
80
Description:
subjects: Interlocking, Railroads, Signaling, Interlocking systems