250.93—Accounts and records of mutual and subsidiary service companies.
Every mutual service company and every company whose organization and conduct of business the Commission has found, pursuant to § 250.88, to meet the requirements of section 13(b) (49 Stat. 825; 15 U.S.C. 79m) shall keep such accounts, cost-accounting procedures, correspondence, memoranda, papers, books, and other records in such manner and preserve them for such periods, as are prescribed in 17 CFR part 257, and shall keep no other records with respect to the same subject matter except (a) records other than accounts, (b) records required by state law, (c) subaccounts or supporting accounts which are not inconsistent with the accounts required by the Uniform System of Accounts ( 17 CFR part 256 ), and (d) such other accounts as may be authorized by the Commission.