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Bifocal spectacles
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When were bifocal spectacles first introduced ?
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http://www.college-optometrists.org/index.aspx /pcms/site.college.What_We_Do.museyeum.online_ exhibitions.artgallery.bifocals/
http://www.college-optometrists.org/index.aspx /pcms/site.college.What_We_Do.museyeum.online_ exhibitions.artgallery.bifocals/
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