Rules on Civil Procedure
Section 1. Subpoena and subpoena duces tecum. - Subpoena is a process directed to a person requiring him to attend and to testify at the hearing or the trial of an action, or at any investigation conducted by competent authority, or for the taking of his deposition. It may also require him to bring with him any books, documents, or other things under his control, in which case it is called a subpoena duces tecum. (1a, R23)