| http://www.w3.org/ns/prov#value | - In a vibratory feeder for feeding product, said feeder including a spring for supporting a first mass from a second mass, the improvementa damper assembly disposed between said first mass and said second mass, said damper assembly being selectively activated; wherein said damper assembly is activated at a first lower level at a first time and at a second higher level at a second time, said second
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