File:1950 Triumph 6T Thunderbird 650cc-motorcycle engine right side.jpg - Wikimedia Commons
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File:1958 Triumph T120 Bonneville 650cc-motorcycle engine right side.jpg - Wikimedia Commons
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File:1971 Triumph T120 Bonneville 650cc-motorcycle engine right side.jpg - Wikimedia Commons
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File:1958 Triumph T120 Bonneville 650cc-motorcycle engine left side.jpg - Wikipedia
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