THE MOTHER OF EXHIBITIONS. AN ELECTRICALLY-OPERATED CLOCK. POSITIVE CONTACT FOR ELECTRIC CLOCK. CLOCK WOUND EVERY SIX MINUTES BY ELECTRICITY. The Scientific American in the Schools. The Current Supplement. Engineering Notes., 1904-05-28
THE MOTHER OF EXHIBITIONS. AN ELECTRICALLY-OPERATED CLOCK. POSITIVE CONTACT FOR ELECTRIC CLOCK. CLOCK WOUND EVERY SIX MINUTES BY ELECTRICITY. The Scientific American in the Schools. The Current Supplement. Engineering Notes., 1904-05-28
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