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If it is played on an unapproved lane or with an unapproved Bowling ball. Years ago, a center had to close the lanes on which a 300 game was bowled so an inspector from the US Bowling Congress could test the oil patterns on each, and each ball you used had to be weighed. Now the lanes in each USBC-approved center are checked once per year, and all you need do is send in the model and serial number of your bowling balls.

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10y ago

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