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This project has no commercial aims, but is an educational project. It is therefore not my intention to promote or advertise any products. No products from companies or organizations were provided for the project either, but were purchased by myself or come from the holdings of the Wiedenbrück Telephone and Radio Museum or other museums. I would like to take this opportunity to thank Richard Kügeler again for his support! Looking back at earlier developments offers a unique opportunity to learn from old patents and to make them relevant to current projects and developments. All written contributions represent my own free opinion. Please note this to avoid misunderstandings. Technical errors can also never be ruled out!