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Line 63: </ref> British ~~and American standards merged in~~standard [[British Standards Institution\|BS]] 1380:1947, ~~which~~adopted ~~abandoned~~the ''~~fixed~~fractional ~~density~~gradient'' ~~in favour~~criterion of ~~''fractional~~the American 1943 ~~gradient''~~standard, and also included ''arithmetic'' speed numbers in addition to ''logarithmic'' speed numbers. <ref>{{citation \| last = Jacobson \| first = Ralph E \| publisher = Focal Press

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