Primarily Petroliana Shop Talk Forums Shop Talk Petroliana Forums General Petroliana Discussion Question about Burdick Tulsa stamp on Humble Sign

I need a little help! This recently purchased Humble Sign is stamped “Burdick Tulsa” in the bottom right corner. My research confirmed the Burdick Sign Company in Chicago Illinois, but in their history references I have not seen any location in Tulsa, Oklahoma. So can anyone explain the meaning of the “Burdick Tulsa” stamp in the corner of this sign? Thanks in advance to anyone who can shine some light.