3M Littmann

Established 1960

In the early 1960s David Littmann, a Harvard Medical School professor, created a new stethoscope with improved acoustic performances for auscultation. Together with Gus Machlup, he founded Cardiosonics, Inc. to manufacture and market his stethoscopes.

In 1967, 3M acquired the stethoscope company and hired Dr. Littmann as a consultant. The iconic Littmann Classic II stethoscope (as pictured above) is the benchmark of all future stethoscopes and, since it is out of patent, it became the basis of a 3D-printed stethoscope as part of the open source Glia project.

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Photo credits
© 3M Littmann

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