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AN arrangement that could send out information about conditions inside a living person could supply scientific information and also become a diagnostic tool in clinical work. For this purpose one would desire a radio method that could perform under approximately physiological conditions. Accordingly, we have produced a small capsule that a person can swallow, and which contains the sensing transducer and the radio transmitter. This device has successfully operated during its passage through the gastro-intestinal tract.

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MACKAY, R., JACOBSON, B. Endoradiosonde. Nature 179, 1239–1240 (1957).

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