101.43—Proceedings following the filing of the petition.
        
        (b) 
         Interested persons may request intervention by a written motion to the Board. Such intervention may be granted at the discretion of the Board.
    
    
    
    
        
        (e) 
         After review of the record, the Board issues a declaratory order as to whether it will assert jurisdiction over the cases, but it will not render a decision on the merits at this stage of the cases.