When did Bee Ace of Spades switch from "The N.Y. Consolidated Card Co." to "Consolidated-Dougherty"? Be precise. Thanks.
Well, I can tell you this:
NYCCC started in 1871.
They were bought by USPC in 1894, which operated them as a separate but wholly-owned company, similar to how USPC owns Fournier today.
They were merged with Dougherty and Standard in 1930, creating Consolidated-Dougherty.
They were finally absorbed into USPC entirely in 1962, becoming a division of the company instead of an independent company owned by them.
It's not terribly exact, but it happened clearly sometime after the 1930 merger of the three companies.
I'd be very surprised if there wasn't an article about this in back issues of Clear the Decks, and possibly even in Card Culture. The electronic archives of both magazines are available to 52+J club members as well as to Conjuring Arts members.