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Proprietary trade secret of Frito Lay, Inc. AFAIK. It has been looked at by competitors very carefully, I am told. If it were easily copied, the market would have been long ago flooded with cheaper competing brands, but there are apparently none. The patent would have run out, being more than 20 years, but no patent was filed to the best of my knowledge, especially a keystone one. Maybe distantly supporting ones, but even that would invite inspection.

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13y ago

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