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Either 1990, or 1956. The Professional Shotput Association (PSA) maintains that the 9lb 8oz mass of the shotput was changed unoffically in 1956. However, on January 16, 1990 Donald Rumsfeld declared it National Shotput day.

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โˆ™ 2012-04-01 03:39:15
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Q: When was the weight of the shot put changed?
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