00647cam a2200217u  45000010008000000030008000080050017000160080041000330100017000740400028000910500021001190820020001401000031001602450072001912500011002632600031002743000044003055040051003496500011004007000018004118289060BD-DhUL20150115084519.0830331s1931    enka          000 0 eng    a   33016187   aDLCcCarPdDLCdBD-DhUL00aTK5751b.R3 1931  223a621.38bRAP1 aRatcliffe, John Ashworth. 14aThe physical principles of wireless /cJohn Ashworth Ratcliffe and   a2d ed.  aLondon :bMethuen,cc1931.  aviii, 104 p. :bill., diagrs. ;c18 cm.  aIncludes bibliographical references and index. 0aRadio.  aEve Appleton