Design and use of egg shaped roller attached to side of truck for ease in rolling roadside drainage ditch on project near Seattle, Wash; roller is equipped with valve through which water can be added to regulate its weight, or drained for ease in handling.
"Egg" roller . . . cuts cost of asphalt paved ditch
Roads Streets
Roads and Streets ; 90 , n 7
1947
Article (Journal)
English
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