There is an article in the MBSI "Mechanical Music" journal for
January/February, 2021, describing small and miniature phonographs,
including the Mikiphone. Also, several of these phonographs are
included in an online auction conducted by the Conestoga Auction
Company. The auction ends on February 27th:

https://www.liveauctioneers.com/catalog/192636_antique-and-americana-auction/?page=2&pageSize=120 

Bill Zaiser