1. 

   Egosummanes Registered Guest

   When did the R in a circle trademark symbol become used? I haven't found any information on that.

    

   Egosummanes, Mar 24, 2020

   #1
2. 

   northstarvintage Administrator Staff Member

   Ha - I have been wondering the same thing myself!
   
   I seem to recall that Reg. U.S. Pat. Off. was used up until about 1947 but I can't confirm that and I can't remember where I learned that.
   
   PS. I love your avatar - that pink nose is too much!

    

   northstarvintage, Mar 24, 2020

   #2

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