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1LlyfrCyhoeddwyd 1971“...International Business Machines Corporation. Data Processing Division...”
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2LlyfrCyhoeddwyd 1961“...International Business Machines Corporation. Data Processing Division...”
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3LlyfrCyhoeddwyd 1960“...International Business Machines Corporation. Data Processing Division...”
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4Cyfresol
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5LlyfrCyhoeddwyd 1964“...International Business Machines Corporation. Data Processing Division...”
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6LlyfrCyhoeddwyd 1969“...International Business Machines Corporation. Data Processing Division...”