WASHINGTON, May 15 -- The National Labor Relations Board issued the following weekly case summary: The Summary of NLRB Decisions is provided for informational purposes only and is not intended to substitute for the opinions of the NLRB. Inquiries should be directed to the Office of the Executive Secretary at 202 273 1940. Summarized Board Decisions Rush University Medical Center and Health Care, Professional, Technical, Office, Warehouse and Mail Order Employees Union Local 743 affiliated wit  more