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    How to become a wireless operator a practical presentation of the theory of electrical waves, their propagation, and their adaptation to wireless communication, including simple an... по Hayward, Charles Brian 1876-

    Опубликовано 1918
    ‌

    How to become a wireless operator a practical presentation of the theory of electrical waves, their propagation, and their adaptation to wireless communication, including simple and clear instructions how to operate wireless devices and how to comply with government requirements for operators

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