created by Gregg Miner, as part of www.minermusic.com
Patent #719,641: The original 1903 patent for the Dolceola's action, issued to Leander and David Boyd.
Patent #857,380: The improved action (to reduce noise), issued to Leander only, in 1907.
The action as it appeared in the 1904 Dolceola Instructor, and on some instruments. My instrument (serial # 2582, theoretically made in 1905) does not have the "flat jack spring (8). According to Cohen's research, this was added somewhere between #s 2793 (1905) and 3660 (1906).
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