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The Huston Self-Leveling Berth
1881
Scientific American
very ingenious, a shov,)l being caused to penetrate the earth, which it raises and delivers upon either side of the ditch at will of the operator. IMPROVED CLEVIS.
doi:10.1038/scientificamerican02191881-115a
fatcat:bi6beau6nzd33pup6qf3esgrsu