TR King - USPC made the large crowns for TR King as late 1929, when 9,000 chips were delivered.
TR King - 1st known records of actual chip production is 1936
This tidbit came from Dennis at TR King.

Red and Black B Hub inlays were sold in Chicago by Mason 8/31/33 to Harry Belford. He owned Benny's restaurant in Lake Charles, LA, a known illegal. These would have been made at USPC.

USPC sold out the old molds to Burt in 1947.
Not sure when the yellow B was made.

You are on your own for the rest of your questions.