CHAMBERS, J.
¶ 1 Lamtec Corporation, based in New Jersey, manufactures insulation and vapor barriers. It sells its products nationwide and did more than $1.1 million in business in Washington State each year during the seven years at issue here. Lamtec has no offices or agents permanently in Washington but regularly sends representatives to visit customers. In 2004, the Department of Revenue (Department) determined that Lamtec's Washington sales were subject...
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