TORONTO - There's growing concern about a move by the United States to make hundreds more product categories subject to the country's 50 per cent tariffs on steel and aluminum content.

The addition of 407 categories of products, ranging from bulldozers to furniture to wind turbines, came into effect earlier this week to add pressure and costs to those hoping to sell into the U.S. market.

"This action is another blow to the integrated economy our two countries have built over the last several decades," said Catherine Cobden, head of the Canadian Steel Producers Association, in a statement released Thursday.

She said the industry is dismayed by the move, which will also affect products like cutlery, propane tanks, air conditioners and agricultural equipment like tractors.

The change is s

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