A manually-operable crimping tool for lockingly securing a seal member upon overlapped end portions of plastic strapping is provided with particular structure such that the resulting crimped seal member and overlapped end portions of the plastic strapping have an undulated configuration whereby the overlapped end portions of the plastic strapping cannot readily become loosened or disengaged with respect to each other under the influence of axially applied tensile forces. The present invention is also directed toward the particularly structured or configured seal member as well as toward the resulting sealed joint formed or defined between the seal member and the overlapped end portions of the plastic strapping.
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