Walcker Orgelbau (also known as E. F. Walcker & Cie.) of Ludwigsburg, Baden-Württemberg, Germany, is a builder of pipe organs.
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Known for distinguished installations and low output, the company built the organ in the Boston Music Hall in Boston, Massachusetts, Zagreb Cathedral in Zagreb, Croatia, and Riga Cathedral in Riga, Latvia.
Merklin was born in Oberhausen and was trained in his craft first by his father and then by Friedrich Hasse in Berne and Eberhard Friedrich Walcker in Ludwigsburg.