CONCORD, N.H. — Several equipment manufacturers, including John Deere, are challenging a new law that gives New Hampshire auto dealers strong new protections in their contracts with them.

The companies say the “Auto Dealers Bill of Rights” which takes effect Sept. 23, jeopardizes their agreements with dealers and is unconstitutional.

In asking for the law, dealers had said they have no leverage in agreements they signed with manufacturers and said manufacturers could require them to pay for costly and unnecessary renovations.

When she signed the bill in June, Gov. Maggie Hassan said it provided a more level playing field between national manufacturers and the local dealerships.

The New Hampshire Auto Dealers Association says the new measure improves a law that has been on the books in the state since 1972.

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