| 1933 UNION SWITCH SIGNAL CO Signal System Railways |
| 1933 LARSON CARL Signal Lamp Patent Print Art |
| 1933 UNION SWITCH & SIGNAL CO Inductive Bond Art |
| 1933 UNION SWITCH SIGNAL CO Railway Braking Art |
| 1933 MAX Electric Horn Other Acoustic Signal Producer |
| 1933 PEARL Automatic Signal Device Patent Print |
| 1933 SIGMUND Motor Driven Alarm Signal Art |
| 1933 G B CHESNUTT R E CHESNUTT Automatic Signal |
| 1933 UNION SWITCH SIGNAL CO Control Railway Switches |
| 1933 GARRETT Design Traffic Signal Unit Patent 49234 |
| 1933 UNION SWITCH SIGNAL CO Automatic Crossing Gate |
| 1933 HOLTZER CABOT ELECTRIC Signal Art Print |
| 1933 CRITCHFIELD ROBERT Sound Signal Patent |
| 1933 UNION SWITCH SIGNAL CO Railway Light Signal |
| 1933 RIEDEL WALTER Sound Signal Patent Print Art |
| 1933 ERNEST Train Stop And Cab Signal System Art |
| 1933 UNION SWITCH & SIGNAL CO Light Signal Art |
| 1933 SUBMARINE SIGNAL CO Oscillator Mounting Art |
| 1933 UNION SWITCH SIGNAL CO Electric Train Signaling |
| 1933 UNION SWITCH & SIGNAL CO Clutch Device Art |
| 1933 UNION SWITCH SIGNAL CO Motor Control Art |
| 1933 LORD Railway Signal System Patent Print Art |
| 1933 GEN RAILWAY SIGNAL CO Train Control System |
| 1933 UNION SWITCH SIGNAL CO Remote Control Art |
| 1933 UNION SWITCH SIGNAL CO Railway Track Circuit |
| 1933 MOONBEAM Signal Viewing Attachment Automobiles |
| 1933 UNION SWITCH SIGNAL CO Remote Indication |
| 1933 SUBMARINE SIGNAL CO Means Producing Sound |
| 1933 JAMISON Ornamentation Signal Plaque Patent 49227 |
| 1933 UNION SWITCH SIGNAL CO Train Control System |
| 1933 UNION SWITCH SIGNAL CO Railway Signaling System |
| 1933 GEN RAILWAY SIGNAL CO Light Signal Unit Art |
| 1933 UNION SWITCH SIGNAL CO Time Measuring Art |
| 1933 DAVID Signal Viewing Attachment Automobiles |
| 1933 SCHIRMER CYRUS Signal Device Patent Print |
| 1933 UNION SWITCH SIGNAL CO Railway Switch Operating |
| 1933 STOKER Signal System For Railways Patent |
| 1933 O'HAGAN BERNARD Light Signal Patent Print |
| 1933 HOWARD Highway Crossing Signal Patent Print |
| 1933 UNION SWITCH SIGNAL CO Signaling System Art |
| 1933 UNION SWITCH SIGNAL CO Highway Crossing Signal |
| 1933 UNION SWITCH SIGNAL CO Railway Car Retarder |
| 1933 SIGNAL Intermittently Operating Electrical |
| 1933 ELECTRIC STORAGE BATTERY CO Railway Signal System |
| 1933 DRIGGS JR Flare Signal Patent Print Art |
| 1933 ASSOCIATED Train Stop Cab Signal System Art |
| 1933 MORSE ROBB Signal Horn Patent Print Art |
| 1933 DELCO REMY CORP Sound Signal Patent Print |
| 1933 UNION SWITCH SIGNAL CO Railway Switch Controlling |
| 1933 FIELD OSCAR Light Signal Unit Patent Print |
| 1933 UNION SWITCH SIGNAL CO Railway Track Brake |
| 1933 ISABEL Motor Driven Alarm Signal Art Print |
| 1933 ADLAKE CO Signal Lamp Patent Print Art |
| 1933 DALZELL Railway Light Signal Patent Print |
| 1933 UNION SWITCH SIGNAL CO Railway Signaling |
| 1933 General Railway Signal 2 page Ad CTC |