Michel Moritz Rothschild was co-owner of the cycle wholesale business Rothschild & Keizer at the Nieuwe Markt 8 in Zwolle. In 1928, the moved the shop to the Oudegracht 196 in Utrecht. His business partner was Louis Keizer.
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In addition, a Jokos file (number 13572) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.