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(*1842): 'Gentleman's
and Citizen's Almanack', 1842, p. 773-774
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(x1912): 'Welt-Adressbuch der gesamten Musikinstrumenten-Industrie', 1912,
Cork p. 520
(digital.sim.spk-berlin.de)
(y1921): 'Guys
Cork Almanach, 1921', p. 201 (CorkPastAndPresent.ie)
(x1926): 'Weltadressbuch der gesammten Musikinstrumenten-Industrie', 1926,
Cork p. 210 (digital.sim.spk-berlin.de)
(¹): 'Histoire de piano de 1700 à 1950',
Mario Pizzi, 1983
(²): 'Makers of
the Piano 1700-1820' and 'Makers of the Piano 1820-1860', Martha Novak
Clinkscale, 1993
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