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Because ballpoint pens were still lousy in the 70's. I remember when they first came out. Our school desks still had a place for ink wells. Ballpoint pens exuded purplish blobs and skipped when you tried to write with them. It took years to get them right. Most of them are not too bad today. When fountain pens began to use cartridges, it was an improvement over the mess filling a fountain pen made, which probably prolonged their use.
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