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Preface: Difference between revisions
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It was the german W.D. Keidel that first used ultrasound to examine the heart in 1950. | It was the german W.D. Keidel that first used ultrasound to examine the heart in 1950. | ||
[[Image:FirstEchoCor.png]] | [[Image:FirstEchoCor.png]] | ||
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[[Image:EdlerHertz.png]] | |||