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No. 18 Public Address Systems - 1922 AT&T Bulletin 2010. No. 19 Index of RCA Developmental and Commercial Type Numbers 2010. No. 20 The Gammatron 2011. No. 21 Tube Complements in Old-Time Communications Equipment 2012. No. 22 German Centimeter-Wave Tubes of WW II 2013. No. 23 The Story of Electronics Development at the General Electric Company 2014 ................
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