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Here is a very useful American Bosch magneto service manual from 1928 that has information on how they work, how to set them up and how to service them. In the latter part of the book are service stations to contact back in 1928. It is general information and maintenence data to help keep your American Bosch in top form. It covers teh DU4, ZR4, and some flywheel mags like the FY used in some Maytags.
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