American sex educator, nurse, and birth control activist who founded the American Birth Control League in 1921 (1879–1966). TLS, one page, 7 x 9.5, Margaret Sanger Research Bureau letterhead, July 22, 1921. Letter to the Birth Control Research Bureau. In part: “It has occurred to me that you may be interested to know of a preparation called ‘Patentex’ that is imported from Europe. It is claimed that this is 100% perfect, but of course, I feel that this cannot be said of any method as so much depends upon the temperament and health of the individual. However, I do say for it that in all the cases I have recommended it I have never heard of a complaint. A tube will last about forty times and no douching is necessary. A tube will cost $3.50 and may be had from Peck and Sterba.” Sanger adds a couple corrections in blue ink. Matted and framed with an image and identification note to an overall size of 17.5 x 14.5. In fine condition, with intersecting folds (one vertical fold passing through a single letter of the signature). Superb content about acquiring birth control from Europe. RR Auction COA.