00273nam a2200121Ia 4500100001700000650002700017654001600044245003000060260002800090082001300118300000800131546001200139  aGibson/G.V.   aElectrical Engineering  aT.V. Signal  aClose Circuit T.V. Signal  bBitman Pub.aLondonc72  a621.3889  a143  aENGLISH