Boeing had sought to have the government pay for a share of the company's cleanup costs, which it says have reached $220 million and counting.

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The U.S. government has agreed to chip in $51 million to clean up pollution at a Seattle site where Boeing made and tested B-17, B-52 and other bomber planes beginning in World War II.

Boeing had sought to have the government pay for a share of the company’s cleanup costs, which it says have reached $220 million and counting. The Departments of Defense, Commerce and other agencies agreed in a proposed settlement filed Wednesday in U.S. District Court in Seattle.

In a lawsuit filed along with the settlement agreement, Boeing argued that the United States owned many of the buildings as well as machinery at the site from 1940 until 1966, when it sold much of the property to Boeing.

The company said the government dictated the type and number of planes built, and that the government is responsible for some of the cleanup.