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Well corrected two element telescope with a flat image   1981
Well corrected two element telescope with a flat image   1981
Well corrected two element telescope with a flat image   1981
Well corrected two element telescope with a flat image   1981
Well corrected two element telescope with a flat image   1981
Well corrected two element telescope with a flat image   1981
Well corrected two element telescope with a flat image   1981
Well corrected two element telescope with a flat image   1981

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