| 1959 MULCAHY Bottom Discharging Hopper Closure Assembly |
| 1959 ENTPR Hopper Door Latching Mechanism Art |
| 1959 ENTPR Hopper Door Operating Mechanism Art |
| 1959 MOORE Means Evacuating Cars Hopper Type Art |
| 1959 JOHNSON Vehicle Hopper Discharge Control |
| 1959 DOREY GEORGE Railway Hopper Car Patent |
| 1959 GILPATRICK MARK Hopper Truck Patent Print |
| 1959 DOREY Hopper Door Operating Mechanism Art |
| 1959 DOREY Hopper Door Latch Mechanism Patent |
| 1959 UNITCAST CORP Hopper Door Locking Mechanism |
| 1959 GILPATRICK CONSTRUCTION COMPAN Hopper Truck |
| 1959 DOREY Hopper Door Latching Mechanism Patent |
| 1959 DATH Hopper Car Discharge Outlet Construction |
| 1959 ACF IND INC Vehicle Hopper Discharge Control |
| 1959 ENTPR Bottom Discharging Hopper Closure Assembly |
| 1959 FRITZ Hopper Door Operating Mechanism Art |
| 1959 CYRUS Hopper Door Locking Mechanism Patent |
| 1959 ENTPR Hopper Door Latch Mechanism Art Print |
| 1959 ENTPR RAILWAY EQUIPMENT CO Railway Hopper Car |
| 1959 ENTPR Hopper Car Discharge Outlet Construction |
| NIP 1959 Cox Space Hopper .049 Model Airplane Engine |