Abstract: According to an embodiment, an electrode group is provided. The electrode group includes a positive electrode, and a negative electrode. The negative electrode active material-containing layer includes a facing section which faces the positive electrode active material-containing layer and a non-facing section which does not. A first fluorine-containing coating is formed on a main surface of the negative electrode active material-containing layer in at least a part of the non-facing section. The abundance ratio of fluorine atoms included in the first fluorine-containing coating is in the range of 2.5 atom % to 10 atom %.

Abstract: A novel physiologically active substance is represented by the formula. ##STR1## The substance is preferably derived from propolis, has excellent antitumor activity and is useful as an antitumor drug.

Abstract: A small scale electronic telephone exchange system of stored program control type having a plurality of trunks and a central computer has been disclosed. The trunks function to process the real time operation and, therefore, the central computer does not need to operate on a real time basis. The central computer always scans the condition of the trunks and the subscriber's telephone terminals and, upon detecting the change of said condition, it analyzes said change and performs the necessary process for said change. The present exchange system provides many new services but the cost of the system is reasonable.