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Automatic and semi-automatic railway signalling

H.S. Petch
1922 Journal of the Institution of Electrical Engineers  

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doi:10.1049/jiee-1.1922.0115 fatcat:s5ipo67owbadpjnwc4kgjz3bpy
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H.S. Petch. "Automatic and semi-automatic railway signalling." Journal of the Institution of Electrical Engineers 61.313 (1922) 81-88