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Radio telegraph identification numbers played a crucial role in maritime and aviation communications during the mid-20th century. These unique codes were used to identify ships, aircraft, and stations transmitting via radio, ensuring clear and secure communication across vast distances. Each number was assigned based on specific regulations and was essential for tracking and managing radio traffic efficiently. The images above show examples of these identification numbers, labeled as A-04-15-5, A-04-15-6, and A-04-15-7. They likely represent different formats or versions of the codes used in official documentation or operational manuals. Such systems helped prevent confusion between similar-sounding callsigns and ensured that messages could be accurately traced back to their source. Understanding these historical codes gives insight into how early radio operators managed communication networks before the widespread use of digital systems. Today, while the methods have evolved, the principles of identification and signal management remain fundamental in modern telecommunications.
Drying Oven is a common type drying machine. Its application scope is wide, temperature is uniform, heat efficiency is high and operation is easy. It is suitable for heating, curing, drying and dehydration of materials and products in chemical, food, agricultural and sideline products, aquatic products, light industry, heavy industry and other industries. Such as API, traditional herbal, extract, powder, granule, drinking agent, packaging bottle, pigment, dye, vegetables, fruits and melons, sausage, plastic resin, electrical components, baking paint, etc.
Tray Dryer,Drying Oven,Vegetable Drying Oven,Fruit Drying Oven
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