Antique Vending Machines

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I have searched all over the web trying to find information on a vending machine set we own. They are both C10 series from National Vendors, Inc. located in St. Louis, MO We think they are circa 1956 and they seem to function fully but the directions on how to operate them have been painted over. We would love any information that relates to these 2 machines. If you even know who could make an accurate appraisal, it would be appreciated. Thanks.