In an audio cassette player, there are two heads: one for playing and the other for recording. When you press the key for the recording head, the playing head also operates and
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![English: Thebiggestmac 08:17, 29 September 2006 (UTC),Marantz CP-430/PMD-430 3-head portable tape deck,made the photo myself; 29 September 2006 (original upload date); Transferred from en.wikipedia to Commons by Liftarn using CommonsHelper ... English: Thebiggestmac 08:17, 29 September 2006 (UTC),Marantz CP-430/PMD-430 3-head portable tape deck,made the photo myself; 29 September 2006 (original upload date); Transferred from en.wikipedia to Commons by Liftarn using CommonsHelper ...](https://c8.alamy.com/comp/2B8Y3TF/english-thebiggestmac-0817-29-september-2006-utcmarantz-cp-430pmd-430-3-head-portable-tape-deckmade-the-photo-myself-29-september-2006-original-upload-date-transferred-from-enwikipedia-to-commons-by-liftarn-using-commonshelper-thebiggestmac-at-english-wikipedia-2B8Y3TF.jpg)