| 1943 GEN Coded Track Circuit Signaling System |
| 1943 BELL TELEPHONE LABOR INC Signaling System |
| 1943 MOORE Railway Signaling System Patent Print |
| 1943 TIZZARD Railway Signaling Apparatus Patent |
| 1943 UNION SWITCH SIGNAL CO Railway Signaling System |
| 1943 MILLER ALBERT Signaling System Patent Print |
| 1943 UNION SWITCH SIGNAL CO Railway Signaling |
| 1943 BELL TELEPHONE LABOR INC Signaling Art |
| 1943 JUDGE Coded Track Circuit Signaling System |
| 1943 HURST Block Signaling System Railways Like |
| 1943 GEN RAILWAY SIGNAL CO Railway Signaling System |
| 1943 PFLASTERER Railway Signaling Apparatus Art |
| 1943 SCOFIELD Warning Signaling System Patent |
| 1943 LUSTFIELD Floating Automatic Signaling Art |
| 1943 SPARKS WITHINGTON CO Warning Signaling System |
| 1943 THOMPSON Railway Signaling System Patent |
| 1943 CRAGO Railway Signaling Apparatus Patent |
| 1943 UNION Block Signaling System Railways Like |
| 1943 PICKELL Railway Signaling System Patent |
| 1943 STAPLES Railway Signaling System Patent |
| 1943 DICKTEN JR Signaling Device Patent Print |
| 1943 MARY W AGNEW Signaling Device Patent Print |
| 1943 FIELD Railway Signaling System Patent Print |
| 1943 YOUNG Railway Signaling Apparatus Patent |
| 1943 BOSSARD GISBERT Signaling Device Patent |