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K. Ma, J. Ma, H. Zhu, J. Miao, M. A. Do, and K. S. Yeo, “DC voltage controlling variable frequency RF/microwave and millimeter resonator” US Provisional 60/603,058 19 Aug. 2004

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Service Invention or Not:no

Pre One:K. Ma, and K. T. Chan, “Quasi-planar Circuits with Air Cavities” PCT Patent WO/2007/149046 (USA), US Patent Appln No: 61/405,244, US patent Number: 13/880,499 Filed in 19, April, 2013

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