MS-658 PVG BASIC LOGIC GATE TUTOR

To cover all aspects of combinational logic and boolean algebra for
study of TTL basic logic gate, seven in one Comprises a selection of
AND, NAND, OR, NOR, EX-OR and EX-NOR gates. Four input toggle
switches and four logic indicators are also given. Supplied
complete with 3 patch lead of 2 or 4 mm. Housed in metal box.