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Only a few of the original production M-4s were actually put into service.

It was finally put back into service on August 2, 1950.

The first new car was put into service in March 2011.

The engine is expected to be put back into service this year.

The new vehicles would be put into service in early 2006.

Line 4 was put into service on April 7, 2012.

It was put into service in September 1999, she said.

It is expected to be put into service by 2014.

It was put back into service in 1992 and is used several times each year.

It is planned to be put into service in 2012.