4 MECHANICAL INVENTIONS. Locking Railway Car Boors in England. Weldless Bing Plates for Boilers. The Fatal Worry. BY ANTONY GUYARD (HUGO TANN). Luminous Meteors., scientific american, 1881-10-22


4 MECHANICAL INVENTIONS. Locking Railway Car Boors in England. Weldless Bing Plates for Boilers. The Fatal Worry. BY ANTONY GUYARD (HUGO TANN). Luminous Meteors., scientific american, 1881-10-22


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