| 1966 PLESKO Material Control Hopper Spreader Art |
| 1966 PHILLIPS Railroad Hopper Type Tank Car Art |
| 1966 DOREY Hopper Discharge Outlet Patent Print |
| 1966 UNITCAST CORP Hopper Doors Operating Assembly |
| 1966 Auger Hopper Construction Patent Print Art |
| 1966 NIEWOLD Auger Hopper Construction Patent |
| 1966 ROBINSON Hopper Feed Regulator Patent Print |
| 1966 UNION TANK CAR CO Railroad Hopper Type Tank Car |
| 1966 UNITCAST Railway Hopper Car Door Locking Mechanism |
| 1966 Material Control Hopper Spreader Patent |
| 1966 RANCH FERTILIZER INC Hopper Trailer Lift Mechanism |
| 1966 ENTPR RAILWAY EQUIPMENT CO Hopper Discharge Outlet |
| 1966 JAY R SHEESLEY Hopper Car Door Actuating Mechanism |
| 1966 ACF IND INC Hopper Structure Patent Print |
| 1966 UNITCAST CORP Shallow Hopper Car Patent |
| 1966 PALM Hopper Trailer Lift Mechanism Art |
| 1966 FLOEHR WALTER Shallow Hopper Car Patent |
| 1966 KEMP WILLARD Hopper Structure Patent Print |
| 1966 FLOEHR Hopper Doors Operating Assembly Art |
| 1966 FLOEHR Railway Hopper Car Door Locking Mechanism |