| 1942 MYER Coded Track Circuit For Railways Art |
| 1942 SNAVELY Circuit Controller Patent Print Art |
| 1942 BRYANT ELECTRIC CO Circuit Interrupter Art |
| 1942 NICHOLSON Railway Signal Control Circuit |
| 1942 PHINNEY Coded Track Circuit Signaling System |
| 1942 SORENSEN Railway Track Circuit Art Print |
| 1942 HATHAWAY Multiple Range Circuit Timer Art |
| 1942 BLOSSER Railway Signal Control Circuit Art |
| 1942 UNION SWITCH SIGNAL CO Railway Track Circuit |
| 1942 ERHARD Electric Circuit Closing Art Print |
| 1942 PFLASTERER Railway Track Circuit Art Print |
| 1942 UNION SWITCH SIGNAL CO Circuit Controller |
| 1942 UNION Railway Signal Control Circuit Art |
| 1942 IRVING Electronic Tube Control Circuit Art |
| 1942 GEN RAILWAY SIGNAL CO Coded Track Circuit Railways |
| 1942 HODGKINS Circuit Interrupter Patent Print |
| 1942 CRAGO Railway Track Circuit Apparatus Art |
| 1942 REMINGTON ARMS INC Electronic Tube Control Circuit |
| 1942 CANNON Electric Circuit Control Patent |
| 1942 GEN ELECTRIC Multiple Range Circuit Timer |
| 1942 GEN Coded Track Circuit Signaling System |
| 1942 Radio Circuit Manual |