Fonti

  • Electric Elevators, Their design, construction, operation and mintenance. by F. A. nnett. McGraw-Hill Book year 1935 second edition
  • Elevator Service, by Reginald Pelham Bolton yuear 1908
  • Elevators, a practical treatise on the development and design of hand, belt, steam, hydraulic, and electric elevators, by John H. Jallings. American Technical society Chicago year 1916
  • Elevators hydraulic and electric by Calvin F. Swingle. Frederick J Drade & Company year 1910
  • Hydraulic elevators, by William Baxter Jr. The engineer publishing co. year 1905
  • Ascensori e montacarichi elettrici di Riccardo Paolelli. Ente Nazionale Prevenzione Infortuni anno 1969
  • Transactions, International Engineering Congress. Passenger Elevators. year 1904
  • L’ascensore idraulico di Riccardo Paolelli. Ulrico Hoepli editore anno 1990
  • Google patents
  • Wikipedia
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