บริษัท วาย เอ็น พี เอ็นจิเนียริ่ง จำกัด Hong-sen Yan states that modern replicas of Zhang's system have failed to reach the level of precision and sensitivity described in Chinese historic records.[one hundred] Wang Zhenduo presented two diverse models on the seismoscope based on the ancient descriptions of Zhang's product.[101] In his https://heng36519753.free-blogz.com/78807755/the-best-side-of-heng365