Process of producing holes with reduced openings

Claim 1

A PROCESS FOR PRODUCING A WORKED METALLIC OBJECT HAVING AT LEAST ONE PASSAGE OF CONTROLLED NON-UNIFORMITY OF CROSS-SECTIONAL AREA WHICH COMPRISES PROVIDING A METALTIC MASS HAVING AT LEAST ONE HOLE OF SUBSTANTIALLY UNIFORM CROSS SECTION THEREIN, AT LEAST PARTLY FILLING SAID HOLE WITH A FILLER BODY EXTENDING THROUGHOUT THE LENGTH OF SAID HOLE AND HAVING REDUCED RESISTANCE TO DEFORMATION OVER ONLY A PORTION OF THE LENGTH THEREOF, TO PROVIDE AT LEAST ONE PREDETERMINED ZONE OF ENHANCED FLOWABILITY AND AT LEAST ONE PREDETERMINED ZONE OF FLOWABILITY LESS THAN THE FLOWABILITY OF THE ZONE OF ENHANCED FLOWABILITY, WORKING THE METALLIC MASS TOGETHER WITH SAID FILLER BODY UNDER SUBSTANTIALLY UNIFORM DEFORMATION FORCES TO INDUCE FLOW OF SAID METALLIC MASS AND SAID FILLER BODY AND THEREAFTER REMOVING SAID FILLER BODY FROM THE THUS-WORKING METALLIC MASS TO OPEN THE THUS-PRODUCED PASSAGE OF CONTROLLED NON-UNIFORM CROSS-SECTIONAL AREA.