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Gas insufflation of the uterus and fallopian tubes was first performed by the author in 1920. Peterson and Cron in 1923 reported 13 pregnancies in 36 infertile couples, and in 1930, the author reported 10 pregnancies in 53 infertile couples. At this period, the writer became interested in the more exact diagnostic procedure of filling the uterine cavity and tubes with radio‐opaque oil, and found that this was also of great diagnostic and therapeutic value.

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