Railway-signalling: mechanical : an introductory treatment of the principles, methods, and equipment for mechanical signalling on railways; the preparation of a signalling scheme; and the principles of interlocking, for railwaymen, students, and others
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書誌事項
Railway-signalling: mechanical : an introductory treatment of the principles, methods, and equipment for mechanical signalling on railways; the preparation of a signalling scheme; and the principles of interlocking, for railwaymen, students, and others
（Pitman's Technical primers series）
Isaac Pitman, 1923