This excerpt taken from the RIG 10-K filed Feb 26, 2009.
With the consent of the Company, any other organization which satisfies the definition of Affiliate under the Savings Plan and which is eligible by the law to do so may adopt this Plan for the benefit of its Employees who are or who become Participants under the Savings Plan, on express condition that the Company assumes no liability as a result of any such adoption of this Plan by any other organization. Such other organization may adopt this Plan by–
The adoption instrument shall specify the effective date of such adoption of the Plan and shall become, as to such organization and persons in its employment, a part of this Plan. The participating Employers under the Plan shall be determined by the Board.
Any participating Employer may withdraw from the Plan by giving 60 days' advance notice in writing of its intention to withdraw to the Committee, unless a shorter notice shall be agreed to by the Committee.