Some articles on bockisch:

Richard Simonton - The Welte-Mignon Piano Rolls
... Invented by Edwin Welte and his brother-in-law Karl Bockisch in Freiburg, Germany, in 1904, the system was applied to organs with the "Welte Philharmonic-Organ" in 1912 ... He added that he and Bockisch had lost nearly everything in the war, but had managed to hide some of the piano rolls in a barn in the Black Forest ... Simonton worked with Welte and Bockisch to rescue the legacy of the rolls ...