; or (2) by the committee acting as a whole or by subcommittee. Subpoenas and interrogatories so authorized may be issued over the signature of the chairman, or ranking minority member, or any member designated by either of them, and may be served by any person designated by the chairman, or ranking minority member, or any member designated by either of them. The chairman, or ranking minority member, or any member designated by either of them (or, with respect to any deposition, answer to interrogatory, or affidavit, any person authorized by law to administer oaths) may administer oaths to any witness. For the purposes of this section, things includes, without limitation, books, records, correspondence, logs, journals, memorandums, papers, documents, writings, drawings, graphs, charts, photographs, reproductions, recordings, tapes, transcripts, printouts, data compilations from which information can be obtained (translated if necessary, through detection devices into reasonably usable form), tangible objects, and other things of any kind.