FIG. 1 is a perspective view of a first embodiment of a dented steel pipe.
FIG. 2 is a front elevation view thereof.
FIG. 3 is a rear elevation view thereof.
FIG. 4 is a left side elevation view thereof.
FIG. 5 is a right side elevation view thereof.
FIG. 6 is a top plan view thereof.
FIG. 7 is a bottom plan view thereof.
FIG. 8 is a cross-sectional view taken along the line 8-8 in FIG. 6.
FIG. 9 is a cross- sectional view taken along the line 9-9 in FIG. 6.
FIG. 10 is a perspective view of a second embodiment of a dented steel pipe.
FIG. 11 is a front elevation view thereof.
FIG. 12 is a rear elevation view thereof.
FIG. 13 is a left side elevation view thereof.
FIG. 14 is a right side elevation view thereof.
FIG. 15 is a top plan view thereof.
FIG. 16 is a bottom plan view thereof.
FIG. 17 is a cross-sectional view taken along the line 17-17 in FIG. 15; and,
FIG. 18 is a cross-sectional view taken along the line 18-18 in FIG. 15.
The length of the dented steel pipe is indeterminate and thus its precise length is not claimed, and the dents are repeated at regular intervals throughout the length of the dented steel pipe.