Letter to Dr. Macleod regarding the application for a United States patent for insulin 11/1922
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Letter to Dr. Macleod regarding the application for a United States patent for insulin 11/1922
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DESCRIPTION
Autograph letter written of The Raleigh Hotel, Washington, D.C. letterhead and signed by Chas. Riches. Reports on the progress he has had in obtaining a United States patent for insulin.
