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Find number abc

If ca1ca - 2c1bb = a700b find number abc. Multiple solutions may exist.

Correct answers: 6

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Artificial heart patent

In 1972, a U.S. patent was issued for a "Soft Shell Mushroom Shaped Heart" to the inventor Willem J Kolff of Salt Lake City, Utah (No. 3,641,591). He also invented an artificial kidney dialysis machine.«

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