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Individual
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Individual
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Priority to FR494491DpriorityCriticalpatent/FR494491A/fr
Application filed by IndividualfiledCriticalIndividual
Priority to GB547417Aprioritypatent/GB112219A/en
Publication of GB112219ApublicationCriticalpatent/GB112219A/en
A pre-cast reinforced concrete interlocking unit for forming casing to contain sand and to be used as protective walling against aerial attack or for other purposes