00266nam a2200109Ia 4500008004100000041000800041082002000049100001800069245005200087260000900139300000800148211209s1975    xx            000 0 und d  aeng  a621.395 N75 JEF  aJEFFERSON C B  aDIGITAL LOGIC AND SWITCHING CIRCUITS OPERATION   c1975  a526