Merchants may also keep a letter and telegram copybook in which they shall copy by mechanical means, in the order of dates, and including the subscribing clause and signature, all letters written by them in connection with their business, and such telegrams as they may transmit. In default of such copybook, merchants shall carefully preserve correct and authentic carbon copies of all letters written or telegrams forwarded by them relative to their business.\nHistory —Commerce Code, 1932, § 34.
Puerto Rico Legal Code