00374nam a2200169Ia 4500 210723s9999||||xx |||||||||||||| ||und|| 55205 621.38174 50  / SOA Soar, R. N. 50 Circuits Using 7400 Series ICs - London - 76 2624 Circuits BK 83465 83465 0 0 0 0 GRB MCASCP MCASCP 1980-02-15 Modern Book Stall 24.00 0 621.38174/SOA O20130 2021-07-25 00:00:00 2021-07-25 BK Electronic Science