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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.

Can you find your instrument listed in these antique catalogs?

Angelus Advertisements
Typical advertisements from the early 20th Century for the Angelus Player Piano System (Wilcox & White)