Abstract: A frequency selecting/switching circuit includes an input terminal, an output terminal, a two-way splitter circuit, a first phase-adjusting circuit, a second phase-adjusting circuit, a first switch, and a second switch. The two-way splitter circuit splits a signal inputted to the input terminal into first and second frequency components and outputs them to its first output end and second output end, respectively. The first output end and second output end of the two-way splitter circuit are connected to a first end of the first phase-adjusting circuit and a first end of the second phase-adjusting circuit, respectively. A second end of the first phase-adjusting circuit and a second end of the second phase-adjusting circuit are connected to the first switch and the second switch, respectively. Each switch switches an output of a signal inputted to its input end, to its output end between a conductive state and a non-conductive state.

Abstract: The present invention relates to a nitrogen containing high speed steel obtained by the powder metallurgical process, which comprises at least 0.40% N, 1.6 to 15% V, C in an amount satisfying the relationship of 0.5 + 0.2V (%) .ltoreq. (C + N) .ltoreq. 0.8 + 0.2V (%), at least one element selected from the group consisting of up to 15% of Cr, up to 10% of Mo, up to 20% of W and up to 15% of Co with the balance iron.