25 Unsolved Problems that Edison is Studying. Fig. 3—END VIEW. THE WORLD'S COLUMBIAN EXPOSITION—TWENTY HORSE POWER OIL ENGINE. Fig. 2VALVE GEAR VIEW., scientific american, 1893-07-08
25 Unsolved Problems that Edison is Studying. Fig. 3—END VIEW. THE WORLD'S COLUMBIAN EXPOSITION—TWENTY HORSE POWER OIL ENGINE. Fig. 2VALVE GEAR VIEW., scientific american, 1893-07-08
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