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Downgrade Claws CAT

Caterpillar falls on margin concerns at a brokerage.
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Caterpillar

(CAT) - Get Caterpillar Inc. Report

slid 2% early Thursday after Stifel Nicolaus cut the tractor maker's shares to hold from buy, saying margins have begun to level off.

Shares fell $1.45 to $74.50.

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