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According to the Baseball library site the year was 1971.

rule 1.16 (a) all players shall use some type of protective helmet while at bat. (b) all players in National Association Leagues shall wear a double ear-flap helmet while at bat. (c) All player entering the Major LEAGUES commencing with the 1983 championship season and every succeeding season thereafter must wear a single ear-flap helmet (or at the player's option a double ear-flap helmet), except those players who were in the Major League during the 1982 season, and who, as recorded in that season, object to wearing a single ear-flap helmet. (d) All catchers shall weara catchers protective helmet, while fielding their positions. (e) All bat/ball boys or girls shall wear a protective helmet while performing their duties.

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โˆ™ 2012-09-29 05:37:50
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Q: When did it become mandatory to wear batting helmets in the major leagues?
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