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			 Perez was sent to join the talks in San Francisco by President 
			Barack Obama, who has come under mounting pressure to intervene in 
			the labor conflict that has rippled through the commercial supply 
			chain across the Pacific and by some estimates could ultimately cost 
			the U.S. economy billions of dollars. 
			 
			His arrival came as several of the busiest West Coast ports, closed 
			to incoming cargo freighters during the three-day holiday weekend, 
			reopened in full for about nine hours on Tuesday, then suspended 
			vessel loading and unloading again for the night. 
			 
			Perez met separately with each party, then met briefly with both 
			sides together, and further sessions were expected on Wednesday, 
			sources familiar with the situation told Reuters. 
			 
			"Secretary Perez made clear that the dispute has led to a very 
			negative impact on the U.S. economy, and further delay risks tens of 
			thousands of jobs and will cost American businesses hundreds of 
			millions of dollars," Labor Department spokeswoman Xochitl Hinojosa 
			said in a statement at day's end. 
			 
			Perez urged the parties "to come to an immediate agreement to 
			prevent further damage to our economy," she said. 
			  
			  
			 
			The International Longshore and Warehouse Union, representing 20,000 
			dockworkers, and the bargaining agent for shippers and terminal 
			operators, the Pacific Maritime Association, have declined public 
			comment since agreeing last Friday to honor a news blackout 
			requested by a federal mediator. 
			 
			The PMA previously said negotiations hit a snag over a union demand 
			for changes in the system of binding arbitration of contract 
			disputes. The union has insisted an accord is near. 
			 
			Labor law experts said Obama has few other options at his disposal 
			to spur a breakthrough in talks, which have dragged on for nine 
			months amid worsening cargo backups and curtailed port operations 
			that the two sides have blamed on each other. 
			 
			And it was not clear what Perez could bring to the table besides the 
			symbolic weight of Cabinet-level involvement. 
			 
			DISRUPTIONS CONTINUE 
			 
			Operations to load and unload cargo vessels at West Coast ports, 
			which handle nearly half of all U.S. maritime trade and more than 70 
			percent of imports from Asia, were halted through the holiday 
			weekend, before resuming during the day on Tuesday. 
			 
			It was the longest such disruption to date in the labor dispute. 
			Vessel operations were likewise ceased through last weekend, and 
			again last Thursday, a union holiday. 
			 
			At the ports of Los Angeles and Long Beach, night vessel operations 
			were suspended again late Tuesday, as they have been nightly since 
			the companies started canceling late shifts on Jan. 12 to focus on 
			daytime work. 
			 
			The same has been true since December at the ports of Oakland, 
			California, and Seattle and Tacoma in Washington state. 
			 
			
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			Daytime work has continued throughout in the dockyards, rail yards 
			and terminal gates. Some smaller ports remained open to night-time 
			vessel operations as well. 
			
			A domino effect has cascaded through the U.S. economy, extending to 
			agriculture, manufacturing, retail and transportation. 
			 
			California farmers have been especially hard hit, with port 
			disruptions posing a major barrier to perishable goods headed to 
			Asian markets and export losses estimated to be running at hundreds 
			of millions of dollars a week. 
			 
			Japan's Honda Motor Co said on Sunday it would slow production for a 
			week at three North American plants due to delays in parts shipments 
			from Asia. Other automakers say they are switching to higher-cost 
			air freight to minimize slowdowns. 
			 
			The union has denied orchestrating work slowdowns, as the companies 
			have charged. Union officials fault changes in shipping practices 
			the carriers themselves have instituted and say that curtailing port 
			operations has only worsened matters. 
			 
			The last time contract talks led to a full shutdown of the West 
			Coast ports was in 2002, when the companies imposed a lockout that 
			was lifted 10 days later under a court order sought by President 
			George W. Bush under the 1947 Taft-Hartley Act. 
			 
			Retail and manufacturing executives have projected that a full, 
			extended shutdown of the ports now could cost the U.S. economy some 
			$2 billion a day. 
			 
			Invoking Taft-Hartley would be a long shot under current 
			circumstances, said Daniel Mitchell, professor emeritus for 
			management and public policy at the University of California, Los 
			Angeles. 
			
			
			  
			
			 
			 
			Obama would need to convince a federal judge that there was a work 
			stoppage - not just a slowdown - stemming from a labor dispute and 
			that it posed a national emergency, rather than an inconvenience to 
			industry, Mitchell said. 
			 
			(Reporting and writing by Steve Gorman in Los Angeles; Additional 
			reporting by Krista Hughes in Washington; Editing by Bill Trott, 
			Eric Walsh & Kim Coghill) 
			
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