Court gives qualified approval to Grids as valid exercise of Secretary's statutory authority. Secretary may, using Grids, take administrative notice that substantial gainful work existed in the national economy for a person with claimant's impairment, background, age and education. Where a claimant presents a prima facie case of disability-i. e., that he can not engage in his previous type of employment-it is the Secretary's responsibility to establish that the claimant can engage in alternate employment and that such employment exists.
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