{"conversationCode":"502-021","tapeNumber":502,"conversationNumber":21,"identifier":"37-wht-conversation-502-021","startDateTime":"1971-05-20T19:58:00.000Z","endDateTime":"1971-05-21T01:43:00.000Z","startDate":"20-May-1971","startTime":"3:58 PM","endDate":"20-May-1971","endTime":"9:43 PM","dateCertainty":"certain","timeCertainty":"estimated","participants":"[Unknown person(s)];","description":"On May 20, 1971, unknown person(s) met in the Oval Office of the White House at an unknown time between 3:58 pm and 9:43 pm. The Oval Office taping system captured this recording, which is known as Conversation 502-021 of the White House Tapes.","locationCode":"OVAL","recordingDevice":"Oval Office","latitudeEstimated":38.8974,"longitudeEstimated":-77.0374,"chronCode":1,"chronRelease":"First Chronological Release","chronReleaseDate":"5-Oct-1999","aogpRelease":null,"aogpSegment":null,"lastModified":"2015-07-27T17:04:10.235Z","findingAid":"Conversation No. 502-21\n\nDate: May 20, 1971\nTime: Unknown between 3:58 pm and 9:43 pm\nLocation: Oval Office\n\nAn unknown person talked with an unknown person.\n\n******************************************************************************\n\n[Previous archivists categorized this section as unintelligible. It has been rereviewed and\ncleared for release. The withdrawal is now categorized as a PRMPA Federal Statute (A) and\nwas reviewed under deed of gift 02/11/2019.]\n[Federal Statute]\n[502-021-w001]\n[Duration: 18s]\n\n******************************************************************************\n\nThe unknown person left at an unknown time before 9:43 pm.","filename":["502-021.mp3"],"tapeStart":"03:55:58","tapeEnd":"03:56:18","participantsList":["[Unknown person(s)]"],"prevCode":"502-020","nextCode":"503-001","transcript":[{"start":0.1,"end":13.42,"text":"Yes, I understand."},{"start":13.98,"end":18.51,"text":"Yes, this is, uh, 4-0-8-6-0-0-0-0-0-0-0-0-0-0-0-0-0-0-0-0."}],"aiSummary":{"text":"This recording captures a brief exchange between unidentified individuals regarding the transmission or verification of a long numeric sequence. The dialogue consists of a confirmation of understanding followed by the recitation of a twenty-digit string, which may have served as a code or a technical identifier. Due to the limited nature of the audio and the lack of identifying context, the specific intent behind the numerical communication remains indeterminable.","topics":["Technical communication","Numeric data","Security protocols","White House operations"],"generatedAt":"2026-04-06T22:26:27.265Z"},"topicSlugs":["technical-communication","numeric-data","security-protocols","white-house-operations"],"audioDurationSec":19,"audioFiles":[{"file":"502-021.mp3","bytes":754207,"durationSec":18.72,"bitrate":322375,"missing":false}],"audioIsShared":false,"audioProbedAt":"2026-09-18T02:19:49.684Z","audio":["https://nixon.nyc3.digitaloceanspaces.com/audio/502-021.mp3"],"url":"https://www.easynixon.org/tapes/502-021","nixonLibraryUrl":"https://www.nixonlibrary.gov/white-house-tapes/502/conversation-502-021","license":"Public domain (U.S. Government work). AI-generated fields (transcript, aiSummary) are provided as-is without warranty."}