Semitist Otto Roessler - beside Igor' M. D'jakonov (1915-1999) and Werner Vycichl (1909-1999) - was one of the most outrstanding minds of Afro-Asiatic (Semito-Hamitic) comparative linguistics in the 20th century. His activity has produced outstanding and the genuine results in the fields of historical consonantism and verbal morphology. This article is to evaluate in detail only one segment of his work, namely his theory on the historical consonantism of Egyptian and Egypto-Semitic comparative phonology, which is still a matter of great controversies and heavy debate
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