RESPONSA - GERMANY Isaac Zekel ben Menahem Etthausen, Sefer Or Neelam (ספר אור נעלם), Karlsruhe, Wilhelm Friederich Lotter, 1765. Two works in one volume. [1], 9, 9-38, [1]; 41 ff, 312:200 mm. wide margins, slight wear and moisture. A very good copy bound in contemporary half leather and dominoté paper, rubbed. R. Isaac Zekel ben Menahem Etthausen (c. 1687-1763), German rabbi. He is the author of "Or Ne'elam", a casuistical collection on subjects he disputed with R. Baruch Rapoport, R. Jonathan Eybeschütz and others; and "Ur Lo be-Zion", a commentary on tractates Berakhot and Halakhot Ketanot. Both works were published after his death by his son, R. Judah Loeb Etthausen (Karlsruhe, 1765). He died in Pfersee, Germany.