Artifact of Watergate
Claiming executive privilege, President Richard Nixon offered Watergate investigators transcriptions of his taped conversations about the 1972 burglary of the Democratic Party headquarters instead of the actual tapes. Rose Mary Woods, secretary to the President, used this machine to transcribe one of the tapes. When she was finished, 18 minutes of a conversation between the President and Chief of Staff H. R. Haldeman, probably related to the break-in, were found to be missing.
National Archives, Records of District Courts of the United States