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| Jabra 510 UC and the Plantronics Calisto 620 UC Speakerphones Go Head to Head (Gear Diary Review). Geardiary.com [online] 7 pages. Posted Aug. 30, 2013 [retrieved on Jul. 23, 2014]. Retrieved from Internet: <http://geardiary.com/2013/08/30/jabra-510-uc-and-the-plantronics-calisto-620-uc-speakerphones-go-head-to-head/>. |