Patentes sobre o assunto:

• Patente do Fonógrafo: Improvement in phonograph or speaking machines (US 200521) 

• Patente US 374.133 

• Patente US 341.212

• Patente US 341.213

• Patente US 341.214

• Patente US 341.287

• Patente US 341.288 

• Patente do Gramofone US 372.786 

• Patente da lampada elétrica US 223.698

----------------------------------------------------------------------

Artigos científicos sobre o assunto:

• The Talking Phonograph. (1877). Scientific American, 37(25), 384–385. doi:10.1038/scientificamerican12221877-384a 

• The Phonograph. (1878). Scientific American, 38(13), 193–193. doi:10.1038/scientificamerican03301878-193 

• The Phonograph and Its Future Author(s): Thomas A. Edison Source: The North American Review, Vol. 126, No. 262 (May - Jun., 1878), pp. 527-536 Published by: University of Northern Iowa Stable URL: https://www.jstor.org/stable/25110210

•  How to Build a Working Phonograph. (1878). Scientific American, 6(133supp), 2112–2114. doi:10.1038/scientificamerican07201878-2112bsupp 

• The New Phonograph. (1887). Scientific American, 57(27), 415–422. doi:10.1038/scientificamerican12311887-415 

-------------------------------------------------------------------------------------

Sites:

• História do fonógrafo do cilindro: https://www.loc.gov/collections/edison-company-motion-pictures-and-sound-recordings/articles-and-essays/history-of-edison-sound-recordings/history-of-the-cylinder-phonograph/

• Origins of Sound Recording: Edison's Path to the Phonograph: https://www.nps.gov/edis/learn/historyculture/origins-of-sound-recording-edisons-path-to-the-phonograph.htm

• Descrição dos Cros "Phonographe" (1877) http://phonozoic.net/n0131.htm

• 10 de outubro de 1877 aparece o primeiro artigo relativo à invenção do fonógrafo, assinado Le Blanc. Sob o pseudônimo deste cronista científico, esconde-se o padre Lenoir, um amigo de Charles Cros. https://www.phonorama.fr/semaine-du-clerge.html 

• Fonógrafo de Edison: https://spectrum.ieee.org/tech-history/dawn-of-electronics/edisons-phonograph

• Spotter’s Guide to the Edison Standard Phonograph: https://www.antiquephono.org/spotters-guide-edison-standard-phonograph/

• Origens da gravação de som: o caminho de Edison para o fonógrafo: https://www.nps.gov/edis/learn/historyculture/origins-of-sound-recording-edisons-path-to-the-phonograph.htm

• A invenção do fonógrafo de Edison: https://www.thoughtco.com/invention-of-the-phonograph-4156528

• Correção da inflação: https://westegg.com/inflation/

------------------------------------------------------------------------------------------------------------

 Consultas realizadas na wikipedia, com muito bom senso é claro:

• North American Phonograph Company: https://en.wikipedia.org/wiki/North_American_Phonograph_Company

• Edison Records: https://en.wikipedia.org/wiki/Edison_Records

• Phonograph: https://en.wikipedia.org/wiki/Phonograph

• Charles Cros: https://en.wikipedia.org/wiki/Charles_Cros

• Phonautograph: https://en.wikipedia.org/wiki/Phonautograph

• Victor Talking Machine Company: https://en.wikipedia.org/wiki/Victor_Talking_Machine_Company

• Graphophone:  https://en.wikipedia.org/wiki/Graphophone#Commercialization

• Columbia Grafonola: https://en.wikipedia.org/wiki/Columbia_Grafonola

• Edison Disc Record: https://en.wikipedia.org/wiki/Edison_Disc_Record

• Volta Laboratory and Bureau: https://en.wikipedia.org/wiki/Volta_Laboratory_and_Bureau#Commercialization_of_phonograph_patents

• Columbia Records: https://en.wikipedia.org/wiki/Columbia_Records

-----------------------------------------------------------------------------------------------

Algumas imagens e vídeos são cortesia de:

• How the Cylinder Phonograph Works: https://www.youtube.com/watch?v=fWLlbk_bI7E

• https://www.youtube.com/watch?v=75UrxueiP-4

• https://www.harpgallery.com/shop/item27944.html

• https://artsandculture.google.com/

• http://edison.rutgers.edu/inventionfactory.htm

• https://www.youtube.com/user/HarpGallery/videos

• https://www.aspireauctions.com/#!/catalog/309/1295/lot/45010

• http://phonographcompany.com/index.php?content=phonographs&manufacturer=3&detail=23

• https://www.tooveys.com/lots/349534/a-late-19th-century-berliner-gramophone-by-the-gramophone-company/

• https://www.harpgallery.com/shop/item22286.html

• https://www.youtube.com/user/wilesco4/featured

Entre tantas outras pesquisas que não lembrei de anotar aqui. Acredito que com estas referências, já consigo dar uma direcionada em quem tiver interesse de pesquisar sobre o tema.