Firms that supply automated machines and other assembly line robots, including Rockwell Automation Inc. and Emerson Electric Co., have in recent weeks celebrated the tax reform provision, expecting increased revenue as clients order more products.

John Stroup, the chief executive of Belden, discussed the capital expenditure provision with J.P. Morgan Vice President Ashwin Kesireddy earlier this month during an investor meeting.

"I would expect there to be an acceleration of capital investment in certain categories if, in fact, the tax plan is passed with the provisions you just mentioned," said Stroup. "There's already a number of factors why people are investing in automation as an example. This would just be another one where they could expense the investment and get the added benefit of the tax shield, which is substantial," he added.

A similar exchange occurred on the last call with investors hosted by Emerson Electric, which produces robots and parts used on the factory floor, including machines used for automotive manufacturing. David Farr, the chief executive of the company, said he expects increased orders from his company's automation department if the tax bill passes with beneficial provisions on capital expenditures.

The instant capital expenditure provision has been long sought and championed by the manufacturing industry.