Sentence:  if a receiver or trustee for any such partnership or corporation , <WSD>duly</WSD> appointed by a court of competent jurisdiction in the United States , makes an assignment of the claim , or any part thereof , with respect to which an award is made , or makes an assignment of such award , or any part thereof , payment shall be made to the assignee , as his interest may appear ; and in the case of any assignment of an award , or any part thereof , which is made in writing and duly acknowledged and filed , after such award is certified to the Secretary of the Treasury , payment may , in the discretion of the Secretary of the Treasury , be made to the assignee , as his interest may appear . 
Meaning of the word marked with <WSD> tags:  at the proper time