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Willers, Friedrich Adolf, 1883-1959. (Personal Name)
LCCN 52-25249: His Mathematische Maschinen und Instrumente, 1951 (hdg.: Willers, Friedrich Adolf, 1883-1959)
LCCN 46-43642: His Mathematische instrumente, 1943 (hdg.: Willers, Friedrich Adolf, 1883-1959; usage: Friedrich Adolf Willers)