NATIONAL INSTITUTE OF METROLOGY P. R. CHINA
Beijing, CN
NATIONAL INSTITUTE OF METROLOGY P. R. CHINA Patent applications | ||
Patent application number | Title | Published |
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20140140179 | INFRASOUND GENERATING DEVICE BASED ON A DISPLACEMENT-FEEDBACK TYPE VIBRATION EXCITER - The infrasound generating device based on a displacement-feedback type vibration exciter comprises a displacement-feedback type vibration exciter system, an infrasound generating chamber ( | 05-22-2014 |