The conglomerate Danaher Corp. closed Monday on its $13.8 billion acquisition of Pall Corp., the 69-year-old Port Washington filtration company.

Pall will operate as a subsidiary of its Washington, D.C., parent and maintain its brand, the companies have said. Pall shares ceased trading Friday on the New York Stock Exchange.

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Danaher has said little about what impact the move will have on Pall's Long Island employees. As of 2012, the company had about 700 workers here.

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Pall is one of two large public companies on Long Island that agreed to be bought by other companies this year.

Lake Success-based Dealertrack Technologies, which sells software to car dealers, is being acquired by Cox Automotive, of Atlanta, owner of Kelley Blue Book. That deal is scheduled to close by October.