The law took effect 1 year from enactment, and so became law in 1947. Off." (Registered with the US Patent Office) label was the precursor to product registration (the R in a circle) under the Lanham Act (also known as the Trademark Act) of 1946. Okay, I had a bit of sticky beak and found this thread on the ebay boards where a poster (who is apparently a qualified lawyer or somesuch) quotes a particular law.
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