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Great Britain. Radio Regulatory Department.

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Performance specification: reserve medium frequency radiotelegraph transmitter for use in merchant ships.
Performance specification: radio telephone alarm signal generating device for use in merchant ships.
Performance specification: radiotelegraph automatic alarm equipment (receiving) for use in merchant ships.
Performance specification: lifeboat radio equipment.
Performance specification: paging transmitters and receivers for usein the UHF on-site paging service.
Great Britain. Radio Regulatory Department. — Books & Biography | Menrva Books