FIG. 1 is a right elevational view of a first embodiment of an internal combustion fastener driving tool showing our new design;

FIG. 2 is a left elevational view;

FIG. 3 is a top plan view;

FIG. 4 is a bottom plan view;

FIG. 5 is a front elevational view;

FIG. 6 is a rear elevational view;

FIG. 7 is a top right perspective view.

FIG. 8 is a right elevational view of a second embodiment of an internal combustion fastener driving tool showing our new design;

FIG. 9 is a left elevational view;

FIG. 10 is a top plan view;

FIG. 11 is a bottom plan view;

FIG. 12 is a front elevational view;

FIG. 13 is a rear elevational view;

FIG. 14 is a top right perspective view.

FIG. 15 is a right elevational view of a third embodiment of an internal combustion fastener driving tool showing our new design;

FIG. 16 is a left elevational view;

FIG. 17 is a top plan view;

FIG. 18 is a bottom plan view;

FIG. 19 is a front elevational view;

FIG. 20 is a rear elevational view; and,

FIG. 21 is a front right perspective view.