Black and white photograph of Arne Solberg, Richard Farnsworth, and M. Lowell Edwards (left to right) demonstrating a machine.

Yellow paper document sent by Lowell Edwards to Albert Starr regarding the use of Teflon tubing on the dog heart valve.

Yellow paper document sent to Albert Starr in which M. Lowell Edwards discusses changes to the valve design, sewing ring, and oscillating ball.

Manuscript notes with formulas and measurements for parts of the Starr-Edwards heart valve.

Manuscript notes with schematics and formulas for the Starr-Edwards heart valve. Shows velocity through the #3 valve at heart stroke.

Manuscript notes showing measurements, figures, and notes on the design of the ball and cage valves including ball to opening ratio, ball size, and availability of materi [...]

Color digital photograph of a Starr-Edwards heart valve prototype, ball-and-cage design with a plastic cage. The valve is lying on its side.

Color digital photograph of a pair of hands pulling back the Silastic shield from the ring of a Starr-Edwards ball-and-cage heart valve prototype.

Color photograph of a Starr-Edwards heart valve prototype with one Silastic flap being lifted from the ring base.

Color digital photograph of a Starr-Edwards heart valve prototype with Silastic flaps, plastic ring, and cloth ring.