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Title: Telegraph block instrument, semaphore type, Walker's, 1855, [Go to resource]
Description: Telegraph block instrument, semaphore type, Walker's, 1855, Stockton & Darlington Railway, No 216, type introduced by Mr C V Walker on the South Eastern Railway. License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: block instrument Temporal: 1855 Source: Science Museum Identifier: 1985-8864 Go to resource More Like this...
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