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So here's the mechanism that started it all, the original Philips cassette recorder. This is a slightly later iteration with the speed regulator board but still the same chassis and layout. :
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Tape Pulling Mechanism of the Cassette Deck. Tape Recorder Stock Image - Image of audio, listen: 238897647
2.972 How Tape Player Drive System Works
The Last Cassette Player Standing - The American Conservative
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SilverCrest Tape Drive Mechanism
Technics RS-B665 Direct Drive Cassette Deck Service - Audio Appraisal