No money authorized to be expended for the acquirement of any dredge or dredges shall be so expended for the purchase of any dredge or dredges from private contractors, which at the time of the proposed purchase can be manufactured at any navy yard or other government-owned factory for a sum less than it can be purchased for from such private contractor.
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33 U.S. Code § 630 - Limitation on expenditure for purchase of dredges
(Sept. 22, 1922, ch. 427, § 5, 42 Stat. 1042.)
Section is from part of section 5 of the Rivers and Harbors Appropriation Act for 1922.
The omitted portion of that section authorized the construction of six seagoing hopper dredges and limited the cost of each to $750,000.