| 1940 FRENTZEL Dumping Mechanism Patent Print Art |
| 1921 BLAKE Dumping Mechanism For Trucks Patent |
| 1922 BEEBE Dumping Mechanism For Trucks Patent |
| 1929 GREER Power Dumping Mechanism Patent Print |
| 1940 FRENTZEL Body Dumping Mechanism Patent |
| 1950 GOLAY Truck Dumping Mechanism Patent Print |
| 1924 CLARK Dumping Mechanism For Vehicles Patent |
| 1940 DAY Truck Dumping Mechanism Patent Print |
| 1923 NAPOLEON Truck Dumping Mechanism Patent |
| 1934 HEIL CO Dumping Mechanism Patent Print Art |
| 1965 JEAN Dumping Mechanism For Vehicles Patent |
| 1965 ORD Container Dumping Mechanism Patent |
| 1932 HEIL CO Dumping Mechanism Patent Print Art |
| 1934 EISENBERG Dumping Mechanism Patent Print |
| 1966 RYAN Toy Dumping Mechanism Patent Print Art |
| 1927 HOWE Dumping Mechanism For Vehicles Patent |
| 1967 HECK Vehicular Dumping Mechanism Patent |
| 1925 ENGLER Automatic Dumping Mechanism Patent |
| 1933 SCHMOHL Car Dumping Mechanism Patent Print |
| 1940 HEIL CO Dumping Mechanism Patent Print Art |
| 1920 BONNER JOSEPH Dumping Mechanism Patent |
| 1932 EISENBERG Dumping Mechanism Patent Print |
| 1923 COULS Truck Body Dumping Mechanism Patent |
| 1927 DEWALD Vehicle Dumping Mechanism Patent |