well, that was a little later that summer, that deputy assistant to president alexander butterfield became a household name. here's his testimony from mid-july of 1973 at the butterfield. are you aware of the installation of any listening devices in the oval office of the president. i was aware of listening devices. yes, sir. when were those devices placed in the oval office. approximately by the summer of 1970. i cannot begin to recall the precise date. my guess, mr. thompson, is that the installation was made between and this is a very rough guess, april or may of 1970, and perhaps the end of the summer or early fall of 1970. are you aware of any devices that were installed in the executive office building office of the president? sir. at that time, were they installed at the same time they were installed at the same time. could you tell us a little bit about how those devices worked, how they were actively added, for example. i don't have the technical knowledge, but i will tell you what i know about how how those devices were triggered, how they were installed. of course, for historica