An electronic control system for controlling the air-fuel ratio for an internal combustion engine comprising an oxygen sensor for detecting the concentration of oxygen in exhaust gases of the engine, an on-off type electromagnetic valve for correcting the air-fuel ratio of the air-fuel mixture supplied by an air-fuel mixture supply device, a comparator for evaluating the output signal of the oxyge...

An apparatus, for assembling a pair of fastener elements (A, B) of a garment fastener, includes a die (10) having at its upper portion a pair of opposed slant flat surfaces (187, 18), and a clamp assembly (12) slidably mounted on the die (10) and normally urged upwardly by a spring (13). The clamp assembly (12) returns to its upper position as a punch (6) is retracted from the die (10) after the t...