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Model 991 ultra-low frequency vibration gauge

YANG Xue shan, DONG Ling, MA Shu lin, CHENG Jian wei (Institute of Engineering Mechanics, China seismological Bureau, Harbin 150080,China)  
This paper introduces the principle and specification of Model 991 ultra low frequency vibration gauge. It can be used for measuring ultra low frequency vibration of long span bridge, highrise building and other structures.
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