HYDRO-PNEUMATIC GUN CARRIAGE. PONSARD'S IMPROVEMENTS IN APPARATUS FOR PUD DLING IRON ETC. PONSARD'S APPARATUS MONCRIEFF'S HYDRO-PNEUMATIC GUN CARRIA GE. FOR PUDDLING IRON Etc., scientific american, 1870-10-08
HYDRO-PNEUMATIC GUN CARRIAGE. PONSARD'S IMPROVEMENTS IN APPARATUS FOR PUD DLING IRON ETC. PONSARD'S APPARATUS MONCRIEFF'S HYDRO-PNEUMATIC GUN CARRIA GE. FOR PUDDLING IRON Etc., scientific american, 1870-10-08
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