| http://www.w3.org/ns/prov#value | - The method can be practiced wherein the welding of the rib to the respective upper and lower half shells is of the resistance spot welding type, or by using half shells each of which include a plurality of longitudinally extending plug weld holes such as round holes or slots punched therethrough and plug welding the rib to the respective upper and lower half shells through the plug weld holes.
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