| 1931 EARNEST Railroad Crossing Gate Patent Print |
| 1931 HUGHES KEENAN CO End Gate Dump Wagons Trucks |
| 1931 BROWN Gate Operating Means Patent Print Art |
| 1931 LEWIS Mechanical Hoist End Gate Patent |
| 1931 FERGUSON Railroad Crossing Gate Patent |
| 1931 LAWRENCE E MURRAY Automatic Railroad Crossing Gate |
| 1931 ANDREW Railway Crossing Gate Patent Print |
| 1931 EDGAR Railroad Crossing Gate Art Print |
| 1931 LARSON Tail Gate Dump Trucks Art Print |
| 1931 GORSUCH End Gate Dump Wagons Trucks Art |
| 1931 BYRD Railway Crossing Gate Patent Print Art |
| 1931 FINN ELLA S DAILEY Railroad Crossing Gate |
| 1931 CHRISTOPHER H OMAN Railroad Crossing Gate |
| 1931 ARMINGTON Gate Operating Gear Dumping Vehicles |
| 1931 LEES Railroad Crossing Gate Patent Print |
| 1931 EVERETT DANIEL Crossing Gate Patent Print |
| 1931 GOLDEN GATE BRIDGE Construction WEST Coast DREAM |
| 1931 ALPHONSO Automatic Railroad Crossing Gate |
| 1931 SMITH Railroad Crossing Gate Patent Print |
| 1931 RUDOLF Level Crossing Gate Patent Print Art |
| 1931 JOSEPH KEENAN Safety Gate Patent Print Art |
| US #698 1931 20c Golden Gate MNH Stamps |
| US #698 1931 20c Golden Gate MNH Stamps |
| US #698 1931 20c Golden Gate MH Stamps |
| Z8 1931 BW Gemany Munchen Stachus m Karl gate Postcard |