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  2. Science AND Invention

    What is said to be an improved and simplified converter which can be hooked up with present radio receivers so that they can be used to pick up frequency ... [ILLUSTRATED]

    Article : 953 words
  3. SCIENCE IN LIFE

    By changing color with changes in weather, a new American ink acts as a weather forecaster when applied to pictures, fabrics ...

    Article : 105 words
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