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   Levy
   Max
   M. L. ;
   
   
   1857
   1926
   Philadelphia ?
   possibly L. J. Levy, owner of a Dry Goods Store at Chestnut St. Philadelphia since 1857
   ->Louis Edward Levy (1846-1919) (brother)
   
   United States of America
   
   
   
   introduced the first commercial halftone screen in 1890
   see his papers 1895-1929 at Library of Congress
   www.worldcat.org/title/ephemera-related-to-the-exhibition-a-portrait-in-halftone-the-levy-brothers-and-the-evolution-of-a-new-process/oclc/8458
   In Memoriam M.L., Philadelphia 1926; Thomas M Whitehead; Elizabeth Pajerski; Temple University. Libraries: A portrait in halftone : the Levy Brothers and the evolution of a new process, Philadelphia 1997; www.worldcat.org/identities/lccn-nr92-15391
   active in Philadelphia, the Levy brothers coated plates of high-quality optical glass with a lacquer, in which parallel lines were grooved; The ruled lines were then etched with hydrofluoric acid and filled with an opaque material. 2 such plates cemented face to face w. lines at 90°, edges sealed
   78641404
   
   


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