| 1944 UNION SWITCH SIGNAL CO Electrical Control |
| 1944 UNION SWITCH SIGNAL CO Indication Art |
| 1944 UNION SWITCH & SIGNAL CO Light Signal Art |
| 1944 UNION SWITCH SIGNAL CO Coded Railway Signaling |
| 1944 UNION Signal System Using Phase Modulation |
| 1944 UNION SWITCH SIGNAL CO Switch Control System |
| 1944 UNION SWITCH SIGNAL CO Railway Braking Art |
| 1944 UNION Highway Crossing Signal Control System |
| 1944 UNION SWITCH SIGNAL CO Railway Signaling System |
| 1944 UNION SWITCH SIGNAL CO Signal Control Art |
| 1944 UNION SWITCH SIGNAL CO Control Art Print |
| 1944 UNION SWITCH SIGNAL CO Train Detecting Reporting |
| 1944 UNION SWITCH & SIGNAL CO Electric Lock Art |
| 1944 UNION SWITCH SIGNAL CO Track Indication System |
| 1944 UNION SWITCH SIGNAL CO Coded Track Circuits |
| 1944 UNION SWITCH SIGNAL CO Coded Signaling System |
| 1944 UNION SWITCH SIGNAL CO Railway Track Circuit |
| 1944 UNION SWITCH SIGNAL CO Circuit Controller |
| 1944 UNION SWITCH SIGNAL CO Traffic Locking Circuit |
| 1944 UNION SWITCH SIGNAL CO Attaching Means Art |
| 1944 UNION SWITCH SIGNAL CO Electrical Control System |
| 1944 UNION SWITCH SIGNAL CO Railway Switch Operating |
| Aug. 1944 notebk:Union Switch & Signal Co. |