| 1944 GEN Highway Crossing Signal System Art |
| 1945 GEN Highway Crossing Signal System Art |
| 1962 GEN Highway Crossing Gate Control System Railroads |
| 1938 WILLING Highway Crossing Signaling System |
| 1938 MACKEY Highway Crossing Signaling System |
| 1932 GEN Highway Crossing Signal System Art |
| 1944 TIZZARD Highway Crossing Signal Control System |
| 1937 ASSOCIATED Highway Crossing Signaling System |
| 1944 UNION Highway Crossing Signal Control System |
| 1926 GRAVES Highway Crossing Signal System Art |
| 1934 HENRY Highway Crossing Signal System Patent |
| 1938 REICHARD Highway Crossing Signaling System |
| 1962 SWANTON Highway Crossing Protection System |
| 1937 NELSON Highway Crossing Signaling System |
| 1934 GEN Highway Crossing Signal System Art |
| 1938 GEN Highway Crossing Signaling System Art |
| 1936 ASSOCIATED Highway Crossing Signaling System |
| 1936 MCCARTHY Highway Crossing Signaling System |
| 1938 FIELD Highway Crossing Signaling System Art |
| 1962 RUSSELL Highway Crossing Signal Control System |
| 1945 ALEXANDER Highway Crossing Signal System |
| 1955 BAUGHMAN Highway Crossing Signal Control System |
| 1932 VALLEE Highway Crossing Signal System Art |
| 1962 GEN Highway Crossing Signal Control System |
| 1938 GEN Highway Crossing Signal System Art |
| 1938 DORSCHEL Highway Crossing Signal System Art |
| 1962 GEN Highway Crossing Protection System Art |