DUMPING-CAR WITH CONVENIENT LOCK AND RELEASE. GERMAN TESTS OF THE PUPIN SYSTEM OF LONG DISTANCE TELEPHONY. COILS. Scientific American IMPROVED LOCKING DEVICE FOR DUMPING-CARS., 1903-06-27

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DUMPING-CAR WITH CONVENIENT LOCK AND RELEASE. GERMAN TESTS OF THE PUPIN SYSTEM OF LONG DISTANCE TELEPHONY. COILS. Scientific American IMPROVED LOCKING DEVICE FOR DUMPING-CARS., 1903-06-27

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