A museum in Dover, DE that is dedicated to 19th and 20th century businessman E.R. Johnson, is particularly focused on what 'V' invention made by his company, one of the leading phonographs and record players of the early 20th century?

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1. A museum in Dover, DE that is dedicated to 19th and 20th century businessman E.R. Johnson, is particularly focused on what 'V' invention made by his company, one of the leading phonographs and record players of the early 20th century?