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Darnalt Leo Thomas
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Darnalt Leo Thomas
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Application filed by Darnalt Leo ThomasfiledCriticalDarnalt Leo Thomas
Priority to ES41725ApriorityCriticalpatent/ES41725A1/en
Publication of ES41725A1publicationCriticalpatent/ES41725A1/en
Improvements in automatic devices to take account of the number of passengers on railways and other vehicles, and also the number of people entering and leaving buildings or similar passages.