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The present invention provides a method of manufacturing a composite array structure that comprises a plurality of elements of an electrically conductive composite material interconnected by at least one region of an electrically insulating material. The method comprises forming regions of the elect

The present invention provides a method of manufacturing a composite array structure that comprises a plurality of elements of an electrically conductive composite material interconnected by at least one region of an electrically insulating material. The method comprises forming regions of the electrically insulating material around regions of the electrically conductive material such that at least a surface of the regions of the electrically insulating material is below a surface of the regions of the electrically conductive material.

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The present invention provides a method of manufacturing a composite array structure that comprises a plurality of elements of an electrically conductive composite material interconnected by at least one region of an electrically insulating material. The method comprises forming regions of the elect

The present invention provides a method of manufacturing a composite array structure that comprises a plurality of elements of an electrically conductive composite material interconnected by at least one region of an electrically insulating material. The method comprises forming regions of the electrically insulating material around regions of the electrically conductive material such that at least a surface of the regions of the electrically insulating material is below a surface of the regions of the electrically conductive material. us. 12. The combination of claim 8 wherein the means for transmitting the second impact comprises an arcuate groove in the rod second end, the groove having a bottom surface of substantially the same diameter as the keeper ring outer diameter, and a pair of substantially parallel side surfaces between the rod second end and the groove bottom surface, the side surfaces being spaced apart a distance slightly greater than the keeper ring predetermined width. 13. In combination with a trenching machine having an endless track of chain links each with at least one collar, and a tooth with a cylindrical groove of a predetermined radius removably retained in said at least one collar by a keeper ring in the tooth groove, the keeper ring having radial end surfaces, an outer diamet