| 1924 BUTTERFIELD Automatic Railway Crossing Signal |
| 1924 FRANK Railroad Crossing Signal Patent Print |
| 1924 HILLIARD Automatic Railway Crossing Signal |
| 1924 KENNEDY Oil Air Operated Crossing Signal |
| 1924 RICHARDS Highway Crossing Signal Patent |
| 1924 JOSEPH BIGGIE Crossing Signal Patent Print |
| 1924 MUNDELL Railway Crossing Signal Patent |
| 1924 MANSFIELD WILLIAM Crossing Signal Patent |
| 1924 VINCENT Automatic Grade Crossing Signal Art |
| 1924 PARKER Railway Crossing Signal Patent Print |
| 1924 HILLHOUSE WADE Crossing Signal Patent Print |
| 1924 STEVENS Railroad Crossing Signal Patent |
| 1924 FRY Railway Crossing Signal Patent Print |
| 1924 BURKLEO JOSEPH Crossing Signal Patent Print |
| 1924 PHILLIPS Railway Crossing Alarm Signal Art |
| 1924 V B PIRCE Crossing Signal Patent Print Art |
| 1924 JOHN Railway Crossing Signal Patent Print |
| 1924 JOHN Railroad Crossing Signal Patent Print |
| 1924 SMITH MELVIN Crossing Signal Patent Print |
| 1924 WEST Railway Crossing Signal Patent Print |
| 1924 SMITH Railroad Crossing Signal Patent Print |