Abstract: A disease control agent and a phytoalexin inducing agent, comprising Streptomyces sp. R-5 as an active ingredient are disclosed. Disease-resistant plants may be produced by inoculating plants with the disclosed Streptomyces sp. R-5. The disease control agent and a phytoalexin inducing agent are further useful in that they have low toxicity to humans and cause no environmental contamination.

Abstract: The present invention provides a disease control agent and a phytoalexin inducing agent, comprising Streptomyces sp. R-5 as an active ingredient.

Abstract: In a key telephone system with a plurality of four-wire key telephone sets wherein a two-wire telephone set is connected to a main control device via a pair of speech lines so that intercom speech and office line speech are possible between the two-wire telephone set and other key telephone sets, the improvement wherein said main control device comprises a call signal generating circuit, first transfer switching means for transfer-connecting said speech lines between a pair of office speech lines and a pair of intercom speech lines, second transfer switching means for transfer-connecting said speech lines between said call signal generating circuit and said first transfer switching means, DC loop supervisory means for supervising a DC loop of said speech lines, and a control circuit inputted with an output of said DC loop supervisory means for controlling said first and second transfer switching means in accordance with the states of said office lines.

Abstract: The present invention relates to a method for producing golden sintered alloys for ornamental purposes and suitable for use in watches. They are mainly composed of 10-40 percent by weight of titanium nitride, 10-30 percent by weight of nickel and valanced niobium carbide. Less than 40 percent by weight of the nickel may be substituted by at least one member from the group of chromium, molybdenum, tungsten and titanium. The alloys have a high degree of hardness (Rockwell A scale), excellent corrosion resistance and a beautiful gold color.