| 1966 TALBERT AUSTIN Dump Trailer Patent Print |
| 1949 PFLANTZ CLARENCE Dump Trailer Patent Print |
| 1956 MCGREW JOHN Dump Trailer Patent Print Art |
| 1954 KLING Side Dump Trailer ATHEY Patent 48545 |
| 1940 RUFUS M KEITH Dump Trailer Patent Print Art |
| 1965 STRADER DON Rear Dump Trailer Patent Print |
| 1943 HEIL CO Bottom Dump Trailer Wagon Patent |
| 1948 POWERS JOHN Dump Trailer Patent Print Art |
| 1968 ROSS Bottom Dump Trailer Structure Patent |
| 1956 KLING ROBERT Rear Dump Trailer Patent Print |
| 1922 LEDYARD Bottom Dump Trailer Patent Print |
| 1965 HOUGH CO FRANK Rear Dump Trailer Patent |
| 1966 GARDNER CLIFFORD Chip Dump Trailer Patent |
| 1940 KEITH HENRY Dump Trailer Patent Print Art |
| 1965 HRIBAR JR Dump Trailer Patent Print Art |
| 1937 CLAUD CARLISLE Dump Trailer Patent Print |
| 1950 SPEARING LEONARD Dump Trailer Patent Print |
| 1939 ALEXANDER FEIGELSON Dump Trailer Patent |
| 1950 MACDONALD Side Dump Trailer Patent Print |
| 1935 HOLZER HIRAM Dump Trailer Patent Print Art |
| 1943 FRENCH Bottom Dump Trailer Wagon Patent |
| 1950 SCHONROCK Cable Dump Trailer Patent Print |