1881-01-01: BELL'S PHOTOPHONE1881-01-08: THE MANUFACTURE OF BOLTS AND NUTS-RUSSLL, BURDSALL & WARD PORT CHESTER, N. Y.1881-01-15: NEW YORK AFPROACH TO EAST RIVER BRIDGE.1881-01-22: EDISON'S STEAM DYNAMO-ELECTRIC MACHINE1881-01-29: IMPROVED SYSTEM FOR MOUNTAIN RAILWAYS.1881-02-05: THE OBELISK PRESENTED BY THE KHEDIVE OF EGYPT TO THE UNITED STATES1881-02-12: THE HERRESHOFF TORPEDO BOAT, STEAM LAUNCH, BOILER AND ENGINE.1881-02-19: BARREL MACHINERY MADE BY E. & B, HOLMES, BUFFALO, N. Y.1881-02-26: ASBESTOS WORKS OF THE H. W. JOHNS MANUFACTURING COMPANY1881-03-05: MAMMOTH FIRE BOAT DESIGNED BY H. S. MAXIM,. M.E.1881-03-12: FURNACES FOR TREATING GARBAGE AND OTHER REFUSE MATTERS1881-03-19: BARREL MACHINERY MADE BY E & B, HOLMES, BUFFALO, N. Y.1881-03-26: PROPRIETARY SPECIALTIES- A VOGELER & CO. BALTIMORE MD1881-04-02: THE BRUSH ELECTRIC LIGHT STATION,- STREET ILLUMINATION IN NEW YORK1881-04-09: FLOUR MILLING.-THE ELECTRIC MIDDLINGS PURIFIER1881-04-16:  MANUFACTURE OF HYDRAULIC AND STEAM SAFETY HOISTING MACHINERY. OTIS BROTHERS & CO. N. Y1881-04-23: THE CHICAGO POLICE TELEPHONE AND PATROL SYSTEM1881-04-30: THE MANUFACTURE OF WRITING PAPERS.- OWEN PAPER COMPANY HOUSATONIC MASS
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1881-01-15: NEW YORK AFPROACH TO EAST RIVER BRIDGE.