WRAPUP 2-U.S. manufacturers raise 2012 forecasts, shares gain

* United Tech, 3M, ITW, Parker Hannifin top estimates
* U.S. demand picks up, particularly for air conditioners
* Europe remains weak, Chinese spending slows
* Industrial shares up


By Scott Malone and Nick Zieminski
April 24 (Reuters) - The year ahead for U.S. industrial
companies is looking a little brighter than it seemed a few
months ago, as economic conditions improve in North America and
demand in key business segments strengthens.
Large manufacturers, led by 3M

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