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Hi,

I think the number 392 was a Convair design,that is because the

MX-423 was a preliminary design for the MX-716,or Convair XA-44

and XB-53,I suggest that it was P.392 as Convair second series

or third as I know,please see;

http://www.designation-systems.net/usmilav/mx/1-499.html

http://www.designation-systems.net/usmilav/mx/500-999.html