holding company system
(2) The term holding company system has the meaning assigned to it by section 2 (a)(9) of the Public Utility Holding Company Act of 1935 (15 U.S.C. 79b (a)(9)), and hence means any holding company, together with all its subsidiary companies (i.e., subsidiary companies within the meaning of section 2(a)(8) of such act (15 U.S.C. 79b (a)(8)), which in general include all companies 10 percent of whose outstanding voting securities is owned directly or indirectly by such holding company) and all mutual service companies of which such holding company or any subsidiary company thereof is a member company. The term mutual service company means a company approved as a mutual service company under section 13 of the Public Utility Holding Company Act of 1935 (15 U.S.C. 79m). The term member company is defined by action 2 (a)(14) of such act (15 U.S.C. 79b (a)(14)), to mean a company which is a member of an association or group of companies mutually served by a mutual service company.