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Title: Semaphore signal arm, lower quadrant, Great Central Railway, [Go to resource]
Description: Semaphore signal arm, lower quadrant, Great Central Railway, stop, by McKenzie & Holland. License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: signal arm Source: Science Museum Creator: McKenzie & Holland Identifier: 2002-7417 Go to resource More Like this...
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