6870SWIVEL HoorcC. E. Richards ' Mass. 6871 —CHuRNJ. L. Rust Keithburg Ill. Schaefer Philadelphia Pa. 6876EXCAVATORG. F. Sheffield Boston Mass. , scientific american, 1871-07-29

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6870SWIVEL HoorcC. E. Richards ' Mass. 6871 —CHuRNJ. L. Rust Keithburg Ill. Schaefer Philadelphia Pa. 6876EXCAVATORG. F. Sheffield Boston Mass. , scientific american, 1871-07-29

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