MR. JUSTICE BRENNAN delivered the opinion of the Court.
The punishment for bank robbery of a fine of not more than $5,000 and imprisonment for not more than 20 years, or both, 18 U. S. C. § 2113 (a), may be enhanced to a fine of not more than $10,000 and imprisonment for not more than 25 years, or both, when the robbery is committed "by the use of a dangerous weapon or device," 18 U. S. C. § 2113 (d).
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