Gramophone inventor Emile Berliner stayed active until the end. As owner of the Berliner Gramophone Company, Ltd. (Victor’s Canadian cousin), he established a second residence in Montreal around 1903, but continued to spend time in Washington, D.C. After Victor acquired the Canadian operation outright in 1927, Berliner returned home for good. According to a late 1920s report, Berliner’s estate at 1438 Columbia Road (on what was then the outskirts of the city) included a separate building housing a laboratory and experimental recording studio.
Exactly what went on in there isn’t well-known (there’s no evidence of any commercial recording activity), but these ads from April–June 1930, which appeared some months after Berliner’s death, might be a good starting point for further investigation. It would also be interesting to determine whether son Herbert (a skilled engineer, who developed his own electrical recording system for the Compo Company in the mid-1920s) had any hand in the Berliner Acoustic System.
(Berliner’s Variety obituary, August 7, 1929)