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A biographical inventory of Italian scientific instrument makers has been conducted through extensive research in public and private collections throughout the world. The time-span is comprised between the 16th and the 18th centuries for each maker information about his signed and dated instruments, categories, collections and references has been given. As the first attempt of a listing of Italian makers, it must be considered as a work in progress. In a short time the text will be transferred on Internet to allow new additions and the corrections brought by the continuation of research.