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Update: 25.01.23

Copyright Dr. Eng. Jan Pająk

Img.534 from Seismograph (#E1c)

Img.534 (#E1c) Another old replica of "houfeng didongy yi". It too reflects very well the parabolic shape of the "antenna chamber" of this device. In 2003, it was shown on the website of "Albertson College" of Idaho, USA.

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