British and French patents, 1861-1862, for John Marshall's invention for 'the collection, concentration and transmission of sound, so as to facilitate the hearing.' Also includes a Belgian 'brevet d'importation.'
Marshall , John , fl 1861-1862 , inventorElements area
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- http://vocabularies.unesco.org/thesaurus/concept543
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Civil law
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Civil law
- UF Private law
- UF Droit privé
- UF Derecho privado