| 1937 HARBERT Dump Car Door Operating Mechanism |
| 1927 HARRY S HART Dump Car Door Control Patent |
| 1926 ARGYLE Dump Car Door Operating Mechanism |
| 1929 MCGAHEY Dump Car Door Lock Patent Print Art |
| 1923 GILPIN GARTH Dump Car Door Patent Print Art |
| 1949 SHEESLEY Dump Car Door Lock Patent Print |
| 1933 PULLMAN CAR & MFG CORP Dump Car Door Patent |
| 1956 LUNDE Dump Car Door Control Means Patent |
| 1926 HARRY IDOINE Dump Car Door Lock Patent |
| 1922 ENTPR Dump Car Door Operating Mechanism |
| 1926 ANDREW GERMEK Dump Car Door Lock Patent |
| 1929 ENTPR Dump Car Door Operating Mechanism Art |
| 1923 NAT DUMP CAR Dump Car Door Latch Art Print |
| 1922 ARGYLE Dump Car Door Operating Mechanism |
| 1927 HOSCEIT Dump Car Door Control Patent Print |
| 1949 ENTPR Dump Car Door Operating Mechanism Art |
| 1933 MUSSEY WILLIAM Dump Car Door Patent Print |
| 1956 MAGOR CAR CORP Dump Car Door Control Means |
| 1926 ENTPR Dump Car Door Operating Mechanism Art |
| 1929 ARGYLE Dump Car Door Operating Mechanism |
| 1921 ARGYLE Dump Car Door Operating Mechanism |
| 1923 NAT DUMP CAR Dump Car Door Latching Mechanism |
| 1923 HART Dump Car Door Locking Releasing Attachment |
| 1949 ZIMMER Dump Car Door Operating Mechanism |
| 1921 NAT DUMP CAR COMPANY Door Shaft Lever Art |
| 1923 HART HARRY Dump Car Door Latch Patent Print |
| 1921 ENTPR Dump Car Door Operating Mechanism |
| 1923 DAVID Dump Car Door Latching Mechanism Art |
| 1937 ILLINOIS Dump Car Door Operating Mechanism |
| 1909 IRWIN Dump Car Door Device Patent 8786 |
| 1923 UNION METAL PROD CO Dump Car Door Patent |