Analysis of information sources in references of the Wikipedia article "石英晶体谐振器" in Chinese language version.
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(帮助), filed April 10, 1918, granted August 27, 1940|publisher=
(帮助), filed April 10, 1918, granted August 27, 1940|publisher=
(帮助), filed April 10, 1918, granted August 27, 1940