00274nam a2200121Ia 4500008004100000100000900041245004500050260001200095300000900107650001200116942000700128999001700135190216s9999||||xx |||||||||||||| ||und||  aNull 0aPopular Video Cassette Recorder Circuits  bBpb Pub  a165p  aPhysics  cBK  c33332d33332