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Title: Automatic timer mechanism for lowering semaphore and traffic [Go to resource]
Description: Automatic timer mechanism for lowering semaphore and traffic indicators, as designed for buses and commercial vehicles, c.1950. License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: timers Temporal: c.1950 Source: Science Museum Identifier: 1997-2203 Go to resource More Like this...
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