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| Directory | Trade Leads | Rated | Visits | Date | Images |
Measuring and security equipment |
 HK20DX Serial High False Frequency GeophoneThe natural frequency of this kind of geophone is 8Hz, 10 Hz, 14 Hz, 17 Hz and 40 Hz. Its distortion is |
0 (#0) | 350 | 2006.06.06 |  |
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