| 1942 NICHOLSON Railway Signaling System Patent |
| 1942 FAILOR Railway Signaling Apparatus Patent |
| 1942 GEN RAILWAY SIGNAL CO Railway Signaling System |
| 1942 SEITZ Railway Signaling System Patent Print |
| 1942 UNION SWITCH SIGNAL CO Railway Signaling |
| 1942 PFLASTERER Railway Signaling System Patent |
| 1942 ALLEN Railway Signaling System Patent Print |
| 1942 YOUNG Railway Signaling System Patent Print |
| 1942 HINES Railway Signaling Apparatus Patent |
| 1942 DICKE Railway Signaling System Patent Print |
| 1942 SHIELDS Railway Signaling System Patent |
| 1942 DERR Railway Signaling Apparatus Patent |
| 1942 UNION SWITCH SIGNAL CO Railway Signaling System |
| 1942 STAPLES Approach Control Railway Signaling Systems |
| 1942 PELIKAN Railway Signaling System Patent |
| 1942 ALLEN Railway Signaling Apparatus Patent |
| 1942 THOMPSON Railway Signaling System Patent |
| 1942 UNION Approach Control Railway Signaling Systems |
| 1942 STAPLES Railway Signaling System Patent |
| 1942 YOUNG Railway Signaling Apparatus Patent |