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.'
- This material is held at
- ReferenceGB 96 MS 756
- Dates of Creation1861-1862
- Name of Creator
- Language of MaterialEnglish French
- Physical Description2 volumes, 2 single sheets
Scope and Content
Administrative / Biographical History
No information was available at the time of compilation.
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