| 1920 LAWES WILLIAM Dumping Device Patent Print |
| 1920 HANCOCK GEORGE Dumping Vehicle Patent Print |
| 1920 HINRICHER GERHARD Dumping Device Patent |
| 1920 LEE LOADER & BODY CO Dumping Hopper Patent |
| 1920 ROSE Dumping Vehicle Body Hoist Art Print |
| 1920 LALLY COMMERCIAL BODY Dumping Vehicle Body Hoist |
| 1920 WEITZEL Side Dumping Wagon Patent Print Art |
| 1920 HANCOCK ROBERT Dumping Scow Patent Print |
| 1920 NATHAN DOUD Dumping Wagon Patent Print Art |
| 1920 LEE ALBERT Dumping Hopper Patent Print Art |
| 1920 TAIT ALFRED Dumping Truck Patent Print Art |
| 1920 SETTLAGE Dumping Mechanism Trucks Like Art |
| 1920 EDWARD Dumping Wagon Attachment Automobiles |
| 1920 RADELEFF CHARLES Dumping Truck Patent Print |
| 1920 LALLY COMMERCIAL BODY Dumping Wagon Hoist |
| 1920 HERMAN End Gate For Dumping Trucks Patent |
| 1920 ARCHIBALD Door Operating Self Dumping Mine Cars |
| 1920 NELSON Dumping Body For Vehicles Patent |
| 1920 HANCOCK Dumping Scow Art |
| 1920 BONNER JOSEPH Dumping Mechanism Patent |
| 1920 YOUNG Dumping Body For Trucks Patent Print |
| 1920 SCHMITT EUGENE Dumping Wagon Patent Print |
| 1920 SETTLAGE Dumping Mechanism Trucks Art Print |
| 1920 ALLEN Door Operating Self Dumping Mine Cars |
| 1920 WILLIAM Hoisting Mechanism Dumping Vehicles |
| 1920 HUGG Dumping Mechanism Autotrucks Art Print |
| 1920 HADDON VIRGIL Dumping Truck Patent Print |
| 1920 WILLIAM Dumping Bed For Wagons Patent Print |
| 1920 LALLY GEORGE Dumping Wagon Hoist Patent |