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A flash freezer doesn't use the power of algorithms to make the fish cold. The algorithm it uses should not be covered by the patent. And in practice the algorithm is probably on a PLC in a nearby closet, not truly part of the machine at all.

With software, the machine is not merely "relying" on physics which in turn "rely" on math. The functionality is purely mathematics. This is very very different from a patent on a machine.

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