FIG. 1 is a perspective view of the front top portion of first embodiment of a concrete bridge unit;
FIG. 2 is a front elevation of the concrete bridge unit of FIG. 1;
FIG. 3 is a side elevation of the concrete bridge unit of FIG. 1;
FIG. 4 is a perspective view of the front top portion of a second embodiment of a concrete bridge unit;
FIG. 5 is a front elevation of the concrete bridge unit of FIG. 4;
FIG. 6 is a side elevation of the concrete bridge unit of FIG. 4;
FIG. 7 is a perspective view of the front top portion of a third embodiment of a concrete bridge unit;
FIG. 8 is a front elevation of the concrete bridge unit of FIG. 7;
FIG. 9 is a side elevation of the concrete bridge unit of FIG. 7;
FIG. 10 is a perspective view of the front top portion of a fourth embodiment of a concrete bridge unit;
FIG. 11 is a front elevation of the concrete bridge unit of FIG. 10;
FIG. 12 is a side elevation of the concrete bridge unit of FIG. 10;
FIG. 13 is a perspective view of the front top portion of a fifth embodiment of a concrete bridge unit;
FIG. 14 is a front elevation of the concrete bridge unit of FIG. 13;
FIG. 15 is a side elevation of the concrete bridge unit of FIG. 13;
FIG. 16 is a perspective view of the front top portion of a sixth embodiment of a concrete bridge unit;
FIG. 17 is a front elevation of the concrete bridge unit of FIG. 16;
FIG. 18 is a side elevation of the concrete bridge unit of FIG. 16;
FIG. 19 is a perspective view of the front top portion of a seventh embodiment of a concrete bridge unit;
FIG. 20 is a front elevation of the concrete bridge unit of FIG. 19;
FIG. 21 is a side elevation of the concrete bridge unit of FIG. 19;
FIG. 22 is a perspective view of the front top portion of an eighth embodiment of a concrete bridge unit;
FIG. 23 is a front elevation of the concrete bridge unit of FIG. 22;
FIG. 24 is a side elevation of the concrete bridge unit of FIG. 22;
FIG. 25 is a perspective view of the front top portion of a ninth embodiment of a concrete bridge unit;
FIG. 26 is a front elevation of the concrete bridge unit of FIG. 25;
FIG. 27 is a side elevation of the concrete bridge unit of FIG. 25;
FIG. 28 is a perspective view of the front top portion of a tenth embodiment of a concrete bridge unit;
FIG. 29 is a front elevation of the concrete bridge unit of FIG. 28;
FIG. 30 is a side elevation of the concrete bridge unit of FIG. 28;
FIG. 31 is a perspective view of the front top portion of an eleventh embodiment of a concrete bridge unit;
FIG. 32 is a front elevation of the concrete bridge unit of FIG. 31;
FIG. 33 is a side elevation of the concrete bridge unit of FIG. 31;
FIG. 34 is a perspective view of the front top portion of a twelfth embodiment of a concrete bridge unit;
FIG. 35 is a front elevation of the concrete bridge unit of FIG. 34; and,
FIG. 36 is a side elevation of the concrete bridge unit of FIG. 34.
The broken lines shown in the drawings are for purposes of illustrating portions of the upper portion of a concrete bridge unit that form no part of the claimed design.
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