| 摘要 |
One of the embodiment of present invention includes at least one transmitter-receiver set including a transmitter and a receiver opposed with an object to be measured therebetween; and a transmission device that estimates the amount of the object based on the attenuation of electromagnetic waves that are transferred between the transmitter and the receiver of the transmitter-receiver set, and transmits information on the estimated amount of the object to be measured.
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