What information last appeared on Canadian coins dated 1947?
Correct! The additional inscription was Et Ind: Imp:, (Et Indiae Imperator); "and Emperor of India".Something along the lines of "Et India Imperial." Once India gained it's independence from Britain, the notation was removed.
India gained independence in July, 1947. The last Canadian coins containing the Et Ind: Imp: inscription were issued in 1948, but dated 1947. There was a demand for new coins before the new dies with the revised inscription were ready. A small maple leaf appears next to the 1947 date on the coins issued in 1948 with the old inscription.