TO INVENTORS. INDEX OF INVENTIONS For which Letters Patent of the United States were Granted June 27 1893 AND EACH BEARING THAT DATE. B. Koenig 600540 Watchcase spring., scientific american, 1893-07-08
TO INVENTORS. INDEX OF INVENTIONS For which Letters Patent of the United States were Granted June 27 1893 AND EACH BEARING THAT DATE. B. Koenig 600540 Watchcase spring., scientific american, 1893-07-08
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