An electromagnetic relay of a simple structure for reliably making and breaking a high load voltage is provided. Whether or not a wiring conductor conducting to a gate electrode becomes an antenna ratio exceeding an allowed antenna ratio in the semiconductor device is determined by determination means 514 and if the wiring conductor exceeds the allowable antenna ratio, one or more repeater cells are inserted into any point of the wiring conductor by selection means 515. Following the completion or substantial completion of the coking operation, the test container is recovered and from the conventional converted coke and the sample of coke are removed from the container for testing and evaluation. A grill comprises a plurality of pipes, is set in the cabinet through the opening of the cabinet, and is downwardly bent, at a portion thereof, to form a food supporting part supporting opposite side surfaces of the food. The penetration depth adjustment mechanism may involve adjusting a travel distance of the needle holding member by adjusting a length of the needle holding member. The contact lugs are arranged in a common plane perpendicular to the ring axis and in each case project in the radial direction from the plastic ring.