Maybe I can put this another way:
Everything USCIS has on this immigrant SHOULD be in the Certificate File (C-file). So you request that by C-file number, which is the certificate number. That number usually appears in the upper right of a 1940's naturalization index card. I see Isidore KRAFTCHICK's C-number is C-6609278 (you have to add the "C" to the front of the number.
Unfortunately, as I noted simply as a warning, sometimes one finds the INS clerks back then did not always follow all the rules for files consolidation. They SHOULD have 1) opened an A-file in 1944 to hold all his existing naturalization application paperwork, 2) pulled the prior Registry File and filed it inside the A-file, and finally 3) upon his naturalization in 1945, converted the A-file (including the Registry File) into a C-file, and sent the C-file to storage. That's why all the files and content SHOULD be in his C-file.
Instead, occasionally we find such a C-file does not include the Registry File. In that case one must go back and retrieve the original Registry File from the set of Registry Files in storage. For a genealogist, that means another $65 (or $130, since one probably has to request a search first too).
In other cases we also see they failed to even consolidate the A-file that may have been created. This situation comes up in some cases of naturalization between 1944 and 1950. IF an A-file exists separately, that's another $65 (because you already have the A-number, you wouldn't need to request a search).
Again, one would first request the C-file to see what is inside. If it includes the Registry---great! If it includes A-file material (docs and correspondence beyond the declaration, petition, certificate)--great! At that point one would be done. If not, the search continues. Every case is "case by case." I cannot tell you exactly what will happen in yours. Chances are good you would get everything in one request for the C-file.