NEW YORK - When Warren Buffett's investment company said on Christmas Day that it would pay $4.5 billion for a 60 percent stake in industrial conglomerate Marmon Holdings Inc., he gave the U.S. industrial segment a much-needed vote of confidence.

Marmon has more than 125 manufacturing and service businesses and is owned by trusts of the Pritzker family of Chicago, which developed the Hyatt Hotel chain. The company has its collective hands in businesses across the transportation, energy and construction markets, with products including railroad tank cars and metal fasteners.

The deal "is most certainly a vote of confidence for 'nuts and bolts' businesses," said Steven Kaplan, a professor of finance at the University of Chicago Graduate School of Business.

Marmon was brought into the Pritzker family by brothers Jay and Robert in 1953, who saw opportunity in the small manufacturing operation in Ohio. Since then, it has grown into a conglomerate that had 2006 revenue of about $7 billion.

Thomas Russo, a partner and portfolio manager at Lancaster, Pa.-based hedge fund Gardner Russo & Gardner, said that an investment in a U.S. industrial company would benefit Buffett's Berkshire Hathaway Inc., as more companies flock overseas to do business more cheaply.

"Through more industrial development going overseas, America has left itself rather vulnerable," Russo said. "And when you get the chance to grab onto a company that offers indispensable technology and can serve a customer's needs quickly, you may actually have quite a competitive advantage."

Berkshire's more than 60 subsidiaries include insurance, clothing, furniture, restaurants, natural gas, candy companies and corporate-jet firms. Berkshire also has major investments in such companies as Coca-Cola Co. and Anheuser-Busch Cos. Inc.

Many of Marmon's businesses overlap those of Berkshire, Russo said, allowing it to strengthen its roots and focus on more acquisitions within its respective sectors.

The deal will follow Buffett's traditional hands-off approach to acquired companies. Marmon's management team will remain in place, and the remaining 40 percent stake in the company will be taken by Berkshire over five to six years, with the price based on Marmon's future earnings.

"It is very typical of his investment strategy," the University of Chicago's Kaplan said. "He buys businesses that he can understand, that are profitable and generating cash, and that is true of Marmon. He also looks for good management teams that he does not have to tinker with. He buys businesses that have staying power, puts in good management, and lets them do their jobs."

The acquisition, pending regulatory and other approvals, is expected to close in the first quarter of next year. At that time, Berkshire said Marmon "will make a substantial distribution of cash and certain assets to the selling shareholders."