Scope and Contents Probably poduced at Cleveland Clinic. National Aeronautics and Space Administration(NASA) high speed photography (500 fps) done at the Lewis Research Center.

1 Natural aorticirca

2 Teardrop (mitral).

3 Cross Jones (aortic).

4 Trapdoor (aortic).

5 Starr-Edwards (aortic).

6 Gott (mitral).

7 Hammersmith (aortic). 8 minutes.