| 1929 JAN Automatic Railroad Crossing Gate Signal |
| 1929 FREDERICK GOODENOUGH Safety Crossing Patent |
| 1929 UNION Controlling Highway Crossing Signals |
| 1929 IRSIK Railroad Crossing Gate Patent Print |
| 1929 SMITH Railroad Crossing Signal Patent Print |
| 1929 MULCH Automatic Railroad Crossing Gate Art |
| 1929 CHARLES Means Operating Railway Crossing Gates |
| 1929 BLANKENSHIP Railway Crossing Signal Patent |
| 1929 JOE DI LISIO Railroad Crossing Gate Patent |
| 1929 PHILLIPS Railroad Crossing Gate Patent |
| 1929 BROOKS Controlling Highway Crossing Signals |
| 1929 MILLER Means Operating Railway Crossing Gates |
| 1929 LOUIS LAMAGNA Crossing Gate Patent Print |
| 1929 DAVIS Railway Crossing Signal Patent Print |
| 1929 CARDWELL Automatic Railroad Grade Crossing Signal |
| 1929 MARIANO Railroad Crossing Gate Patent Print |
| 1929 REITZ Railway Crossing Signal Patent Print |
| 1929 STANLEY Automatic Railroad Grade Crossing Signal |
| 1929 PRATH Railroad Crossing Gate Patent Print |
| 1929 WILLIAM JONES Crossing Signal Patent Print |