8,007,848 (Aug. 30, 2011), W. Garrison, et al., assigned to Frito-Lay North America, Inc., Plano, TX

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A pneumatic system transports seasoning from a hopper to food items in a rotating drum using a combination of an educator and four inline compressed-air-operated vacuum generators. Each vacuum generator has a distributing nozzle roughly shaped like a collared spool. Compressed air exits through swirl ports at the spool exit, creating a broad and even seasoning plume.