Preface: Difference between revisions

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33 bytes added ,  25 September 2007
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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]]

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