Mr. Frazier. There would be no similarity in the individual microscopic characteristics between the two bolt faces.
Mr. Eisenberg. There actually was none?
Mr. Frazier. No, there was none.
Mr. Eisenberg. In the bolt face with which we are dealing, Exhibit 139, can you say from inspection whether the markings on that bolt face are predominantly the accidental markings introduced subsequent to manufacture, or the markings of the manufacture?
Mr. Frazier. I would say that these were filing marks for the most part which were made during manufacture, some of which have been obliterated and changed through use—possibly corrosion.
Mr. Eisenberg. Mr. Frazier, taking Exhibit 543, did you prepare a photograph of this exhibit——
Mr. Frazier. Yes, sir.
Mr. Eisenberg. Compared with the test cartridge case?
Mr. Frazier. Yes, sir; this is the photograph, showing the test cartridge case from Exhibit 557 on the right and the cartridge case 543 on the left.
Mr. Eisenberg. This was prepared by you or under your supervision?