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Update: 25.01.23

Copyright Dr. Eng. Jan Pająk

Img.537 from Seismograph (#E3)

Img.537 (#E3) There is a factory in Hong Kong calling itself "Sinopro International Ltd." that produces replicas of this instrument for interested customers. The photo above shows two replicas of the "Zhang Heng seismograph," which were produced just by this factory and installed at the Sheraton Hotel of Chengdu, China.

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