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The “Angelus” was an early brand of player piano mechanism built by the Wilcox & White Piano & Organ Company of Meridian, CT, circa 1877-1929.  The Angelus player system was a standard mechanical player system while the “Artrio-Angelus” was a more advanced version of the player system that played with expression and human nuance.
The Angelus and Artrio-Angelus systems were installed in several different brands of American-made pianos.  In 1909 the London firm of Sir Herbert Marshall & Company entered into a contract with Wicox & White which allowed his firm the exclusive representation of the Angelus player mechanism in Great Britain.

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Early 20th Century advertisements for the Angelus Player Piano System