| 1920 DAVID HAUNSON Amusement Apparatus Patent |
| 1920 WENZEL Power Transmission Apparatus Patent |
| 1920 PARMELE Steering Apparatus Patent Print Art |
| 1920 ALBERT Boat Listing Apparatus Patent Print |
| 1920 GRUMME Apparatus For Raising Ships Patent |
| 1920 AMES Railway Switch Apparatus Patent Print |
| 1920 SHARPE Game Apparatus Design Patent 7180 |
| 1920 FREDERICK Amusement Apparatus Patent Print |
| 1920 JACK Scenic Amusement Apparatus Patent |
| 1920 EUGENE Apparatus For Aiming Guns Patent |
| 1920 SIMON Apparatus For Sea Navigation Patent |
| 1920 HINER Swine Feeding Apparatus Patent Print |
| 1920 MATT Vessel Raising Apparatus Patent Print |
| 1920 MICHAEL Ship Raising Apparatus Patent Print |
| 1920 THORWARD Game Apparatus Patent Print Art |
| 1920 HERMAN BARBER Spraying Apparatus Patent |
| 1920 TREVOR Recoil Apparatus Of Ordnance Patent |
| 1920 AMELIA Game Apparatus Patent Print Art |
| 1920 HARRY Train Control Apparatus Patent Print |
| 1920 JOE Mail Delivery Apparatus Patent Print |
| 1920 SCHMIDT Aeronautical Apparatus Patent Print |
| 1920 PENDERGAST Diving Apparatus Patent Print |
| 1920 LEO BLUMENFELD Game Apparatus Patent Print |
| 1920 WENZEL Power Transmission Apparatus Patent |
| 1920 HADDOCK Aeronautical Apparatus Patent Print |
| 1920 SIMMON KARL Control Apparatus Patent Print |
| 1920 EUGENE Apparatus For Loading Guns Patent |
| 1920 HOPKINS Vehicle Shipping Apparatus Patent |
| 1920 LEEDS & NORTHRUP CO Timing Apparatus Patent |
| 1920 SAXE WALTER Panoramic Apparatus Patent |
| 1920 RIDGWAY Amusement Apparatus Patent Print |
| 1920 JOSEPH Testing And Tuning Apparatus Patent |
| 1920 DEAM HENRY Galvaging Apparatus Patent Print |
| 1920 FULLER Boat Launching Apparatus Patent |
| 1920 HENRY Flame Projector Apparatus Patent |
| 1920 LEAVITT BENJAMIN Diving Apparatus Patent |
| 1920 ALFRED COPONY Decking Apparatus Patent |
| 1920 EUGENE Aiming Apparatus For Guns Patent |
| 1920 ISMAEL Apparatus For Catching Flies Patent |
| 1920 SWARTWOUT Observation Apparatus Patent |
| 1920 COOVER HARRY Game Apparatus Patent Print |
| 1920 CHARLES Salvaging Apparatus Patent Print |
| 1920 ANDREW PREBBLE Game Apparatus Patent Print |
| 1920 LEE Stock Feeding Apparatus Patent Print |
| 1920 JOHNSON Ship Steering Apparatus Patent |
| 1920 ENID BEAUPRE Game Apparatus Patent Print |
| 1920 KEARNEY Log Hauling Apparatus Patent Print |
| 1920 SMITH IRVING Timing Apparatus Patent Print |
| 1920 BAXTER Upholstering Apparatus Patent Print |
| 1920 JOSEPH BUROFSKY Lifting Apparatus Patent |
| 1920 JACOBS Toy Game Apparatus Patent Print Art |
| 1920 DAVID HAUNSON Amusement Apparatus Patent |
| 1920 FREDERICK J STOLPE Brake Apparatus Patent |
| 1920 HERR Power Developing Apparatus Patent |
| 1920 WILLIAM Telemotor Apparatus Patent Print |
| 1920 STUART Amusement Apparatus Patent Print Art |
| 1920 STEWART Game Apparatus Patent Print Art |
| 1920 KLASING AUGUSTUS Brake Apparatus Patent |
| 1920 BUTCHER Amusement Apparatus Patent Print |
| 1920 BONAVENTURE Game Apparatus Patent Print Art |
| 1920 LE Airplane Launching Apparatus Patent |
| 1920 OBERLIN SMITH Game Apparatus Patent Print |
| 1920 WINKLEY Automatic Steering Apparatus Patent |
| 1920 JORGEN Apparatus For Producing Sound Patent |
| 1920 CARL Apparatus For Aerial Navigation Patent |
| 1920 MACTAGGART Telemotor Apparatus Patent Print |
| 1920 OMAR Overhead Transit Apparatus Patent |
| 1920 ANDERSON GEORGE Game Apparatus Patent Print |
| 1920 DEAM HENRY Salvaging Apparatus Patent Print |
| 1920 HENRY RYAN Amusement Apparatus Patent Print |
| 1920 FRED Log Rafting Apparatus Patent Print Art |
| 1920 HOOPER Amusement Apparatus Patent Print Art |
| 1920 CHARLES Amusement Apparatus Patent Print |
| 1920 CLARK BARROWS Game Apparatus Patent Print |
| 1920 KING EDWARD Game Apparatus Patent Print Art |
| 1920 GIUSEPPE Gunnery Training Apparatus Patent |
| 1920 DREW Stock Watering Apparatus Patent Print |
| 1920 SENSEMAN Playground Apparatus Patent Print |
| 1920 HARALD Life Saving Apparatus Patent Print |
| 1920 NEEPER Wreck Salvaging Apparatus Patent |