see various links in https://de.wikipedia.org/wiki/Wilhelm_Halffter ;
Omar Nasim: James Nasmyth's Hands, Eyes and Mind in Photography, forthcoming in Nuncius in 2016 ;
This entry on a pioneer German daguerretypist was suggested by Omar Nasim; W. H. W. Halffter owned a photographical atelier in Berlin, Leipziger Straße 97 (1851-63), resp. in No. 118 (1864) and in No. 91 (until 1866); thereafter he does no longer appear in Berliner Adressbücher.
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